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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
96277b2d | 2 | Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995 Free Software Foundation, Inc. |
db9f0278 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
96277b2d | 8 | the Free Software Foundation; either version 2, or (at your option) |
db9f0278 JB |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
db9f0278 JB |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
db9f0278 | 23 | #include "lisp.h" |
9ac0d9e0 | 24 | #include "blockinput.h" |
db9f0278 JB |
25 | |
26 | #ifndef standalone | |
27 | #include "commands.h" | |
1f98fa48 | 28 | #include "keyboard.h" |
db9f0278 JB |
29 | #else |
30 | #define INTERACTIVE 1 | |
31 | #endif | |
32 | ||
33 | #include <setjmp.h> | |
34 | ||
35 | /* This definition is duplicated in alloc.c and keyboard.c */ | |
36 | /* Putting it in lisp.h makes cc bomb out! */ | |
37 | ||
38 | struct backtrace | |
39 | { | |
40 | struct backtrace *next; | |
41 | Lisp_Object *function; | |
42 | Lisp_Object *args; /* Points to vector of args. */ | |
daa37602 JB |
43 | int nargs; /* Length of vector. |
44 | If nargs is UNEVALLED, args points to slot holding | |
45 | list of unevalled args */ | |
db9f0278 JB |
46 | char evalargs; |
47 | /* Nonzero means call value of debugger when done with this operation. */ | |
48 | char debug_on_exit; | |
49 | }; | |
50 | ||
51 | struct backtrace *backtrace_list; | |
52 | ||
82da7701 JB |
53 | /* This structure helps implement the `catch' and `throw' control |
54 | structure. A struct catchtag contains all the information needed | |
55 | to restore the state of the interpreter after a non-local jump. | |
56 | ||
57 | Handlers for error conditions (represented by `struct handler' | |
58 | structures) just point to a catch tag to do the cleanup required | |
59 | for their jumps. | |
60 | ||
61 | catchtag structures are chained together in the C calling stack; | |
62 | the `next' member points to the next outer catchtag. | |
63 | ||
64 | A call like (throw TAG VAL) searches for a catchtag whose `tag' | |
65 | member is TAG, and then unbinds to it. The `val' member is used to | |
66 | hold VAL while the stack is unwound; `val' is returned as the value | |
67 | of the catch form. | |
68 | ||
69 | All the other members are concerned with restoring the interpreter | |
70 | state. */ | |
db9f0278 JB |
71 | struct catchtag |
72 | { | |
73 | Lisp_Object tag; | |
74 | Lisp_Object val; | |
75 | struct catchtag *next; | |
76 | struct gcpro *gcpro; | |
77 | jmp_buf jmp; | |
78 | struct backtrace *backlist; | |
79 | struct handler *handlerlist; | |
80 | int lisp_eval_depth; | |
81 | int pdlcount; | |
82 | int poll_suppress_count; | |
83 | }; | |
84 | ||
85 | struct catchtag *catchlist; | |
86 | ||
87 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; | |
ad236261 | 88 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
89 | Lisp_Object Qmocklisp_arguments, Vmocklisp_arguments, Qmocklisp; |
90 | Lisp_Object Qand_rest, Qand_optional; | |
91 | Lisp_Object Qdebug_on_error; | |
92 | ||
6e6e9f08 RS |
93 | /* This holds either the symbol `run-hooks' or nil. |
94 | It is nil at an early stage of startup, and when Emacs | |
95 | is shutting down. */ | |
db9f0278 JB |
96 | Lisp_Object Vrun_hooks; |
97 | ||
98 | /* Non-nil means record all fset's and provide's, to be undone | |
99 | if the file being autoloaded is not fully loaded. | |
100 | They are recorded by being consed onto the front of Vautoload_queue: | |
101 | (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */ | |
102 | ||
103 | Lisp_Object Vautoload_queue; | |
104 | ||
105 | /* Current number of specbindings allocated in specpdl. */ | |
106 | int specpdl_size; | |
107 | ||
108 | /* Pointer to beginning of specpdl. */ | |
109 | struct specbinding *specpdl; | |
110 | ||
111 | /* Pointer to first unused element in specpdl. */ | |
112 | struct specbinding *specpdl_ptr; | |
113 | ||
114 | /* Maximum size allowed for specpdl allocation */ | |
115 | int max_specpdl_size; | |
116 | ||
117 | /* Depth in Lisp evaluations and function calls. */ | |
118 | int lisp_eval_depth; | |
119 | ||
120 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
121 | int max_lisp_eval_depth; | |
122 | ||
123 | /* Nonzero means enter debugger before next function call */ | |
124 | int debug_on_next_call; | |
125 | ||
128c0f66 | 126 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 127 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 128 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 129 | |
128c0f66 | 130 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 131 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 132 | Lisp_Object Vdebug_on_error; |
db9f0278 | 133 | |
fc950e09 KH |
134 | /* List of conditions and regexps specifying error messages which |
135 | do not enter the debugger even if Vdebug_on_errors says they should. */ | |
136 | Lisp_Object Vdebug_ignored_errors; | |
137 | ||
61ede770 | 138 | /* Non-nil means call the debugger even if the error will be handled. */ |
57a6e758 | 139 | Lisp_Object Vdebug_on_signal; |
61ede770 RS |
140 | |
141 | /* Hook for edebug to use. */ | |
142 | Lisp_Object Vsignal_hook_function; | |
143 | ||
db9f0278 | 144 | /* Nonzero means enter debugger if a quit signal |
128c0f66 | 145 | is handled by the command loop's error handler. */ |
db9f0278 JB |
146 | int debug_on_quit; |
147 | ||
be857679 | 148 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 149 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 150 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
151 | know that the debugger itself has an error, and we should just |
152 | signal the error instead of entering an infinite loop of debugger | |
153 | invocations. */ | |
154 | int when_entered_debugger; | |
db9f0278 JB |
155 | |
156 | Lisp_Object Vdebugger; | |
157 | ||
158 | void specbind (), record_unwind_protect (); | |
159 | ||
420e60e6 RS |
160 | Lisp_Object run_hook_with_args (); |
161 | ||
db9f0278 JB |
162 | Lisp_Object funcall_lambda (); |
163 | extern Lisp_Object ml_apply (); /* Apply a mocklisp function to unevaluated argument list */ | |
164 | ||
165 | init_eval_once () | |
166 | { | |
167 | specpdl_size = 50; | |
716acfce | 168 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 169 | specpdl_ptr = specpdl; |
db9f0278 | 170 | max_specpdl_size = 600; |
969f5145 | 171 | max_lisp_eval_depth = 300; |
34d470ba RS |
172 | |
173 | Vrun_hooks = Qnil; | |
db9f0278 JB |
174 | } |
175 | ||
176 | init_eval () | |
177 | { | |
178 | specpdl_ptr = specpdl; | |
179 | catchlist = 0; | |
180 | handlerlist = 0; | |
181 | backtrace_list = 0; | |
182 | Vquit_flag = Qnil; | |
183 | debug_on_next_call = 0; | |
184 | lisp_eval_depth = 0; | |
be857679 | 185 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 186 | when_entered_debugger = -1; |
db9f0278 JB |
187 | } |
188 | ||
189 | Lisp_Object | |
190 | call_debugger (arg) | |
191 | Lisp_Object arg; | |
192 | { | |
193 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
194 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
195 | if (specpdl_size + 40 > max_specpdl_size) | |
196 | max_specpdl_size = specpdl_size + 40; | |
197 | debug_on_next_call = 0; | |
be857679 | 198 | when_entered_debugger = num_nonmacro_input_events; |
db9f0278 JB |
199 | return apply1 (Vdebugger, arg); |
200 | } | |
201 | ||
202 | do_debug_on_call (code) | |
203 | Lisp_Object code; | |
204 | { | |
205 | debug_on_next_call = 0; | |
206 | backtrace_list->debug_on_exit = 1; | |
207 | call_debugger (Fcons (code, Qnil)); | |
208 | } | |
209 | \f | |
210 | /* NOTE!!! Every function that can call EVAL must protect its args | |
211 | and temporaries from garbage collection while it needs them. | |
212 | The definition of `For' shows what you have to do. */ | |
213 | ||
214 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
215 | "Eval args until one of them yields non-nil, then return that value.\n\ | |
216 | The remaining args are not evalled at all.\n\ | |
217 | If all args return nil, return nil.") | |
218 | (args) | |
219 | Lisp_Object args; | |
220 | { | |
221 | register Lisp_Object val; | |
222 | Lisp_Object args_left; | |
223 | struct gcpro gcpro1; | |
224 | ||
265a9e55 | 225 | if (NILP(args)) |
db9f0278 JB |
226 | return Qnil; |
227 | ||
228 | args_left = args; | |
229 | GCPRO1 (args_left); | |
230 | ||
231 | do | |
232 | { | |
233 | val = Feval (Fcar (args_left)); | |
265a9e55 | 234 | if (!NILP (val)) |
db9f0278 JB |
235 | break; |
236 | args_left = Fcdr (args_left); | |
237 | } | |
265a9e55 | 238 | while (!NILP(args_left)); |
db9f0278 JB |
239 | |
240 | UNGCPRO; | |
241 | return val; | |
242 | } | |
243 | ||
244 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
245 | "Eval args until one of them yields nil, then return nil.\n\ | |
246 | The remaining args are not evalled at all.\n\ | |
247 | If no arg yields nil, return the last arg's value.") | |
248 | (args) | |
249 | Lisp_Object args; | |
250 | { | |
251 | register Lisp_Object val; | |
252 | Lisp_Object args_left; | |
253 | struct gcpro gcpro1; | |
254 | ||
265a9e55 | 255 | if (NILP(args)) |
db9f0278 JB |
256 | return Qt; |
257 | ||
258 | args_left = args; | |
259 | GCPRO1 (args_left); | |
260 | ||
261 | do | |
262 | { | |
263 | val = Feval (Fcar (args_left)); | |
265a9e55 | 264 | if (NILP (val)) |
db9f0278 JB |
265 | break; |
266 | args_left = Fcdr (args_left); | |
267 | } | |
265a9e55 | 268 | while (!NILP(args_left)); |
db9f0278 JB |
269 | |
270 | UNGCPRO; | |
271 | return val; | |
272 | } | |
273 | ||
274 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
275 | "(if COND THEN ELSE...): if COND yields non-nil, do THEN, else do ELSE...\n\ | |
276 | Returns the value of THEN or the value of the last of the ELSE's.\n\ | |
277 | THEN must be one expression, but ELSE... can be zero or more expressions.\n\ | |
278 | If COND yields nil, and there are no ELSE's, the value is nil.") | |
279 | (args) | |
280 | Lisp_Object args; | |
281 | { | |
282 | register Lisp_Object cond; | |
283 | struct gcpro gcpro1; | |
284 | ||
285 | GCPRO1 (args); | |
286 | cond = Feval (Fcar (args)); | |
287 | UNGCPRO; | |
288 | ||
265a9e55 | 289 | if (!NILP (cond)) |
db9f0278 JB |
290 | return Feval (Fcar (Fcdr (args))); |
291 | return Fprogn (Fcdr (Fcdr (args))); | |
292 | } | |
293 | ||
294 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
295 | "(cond CLAUSES...): try each clause until one succeeds.\n\ | |
296 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\ | |
297 | and, if the value is non-nil, this clause succeeds:\n\ | |
298 | then the expressions in BODY are evaluated and the last one's\n\ | |
299 | value is the value of the cond-form.\n\ | |
300 | If no clause succeeds, cond returns nil.\n\ | |
301 | If a clause has one element, as in (CONDITION),\n\ | |
302 | CONDITION's value if non-nil is returned from the cond-form.") | |
303 | (args) | |
304 | Lisp_Object args; | |
305 | { | |
306 | register Lisp_Object clause, val; | |
307 | struct gcpro gcpro1; | |
308 | ||
309 | val = Qnil; | |
310 | GCPRO1 (args); | |
265a9e55 | 311 | while (!NILP (args)) |
db9f0278 JB |
312 | { |
313 | clause = Fcar (args); | |
314 | val = Feval (Fcar (clause)); | |
265a9e55 | 315 | if (!NILP (val)) |
db9f0278 JB |
316 | { |
317 | if (!EQ (XCONS (clause)->cdr, Qnil)) | |
318 | val = Fprogn (XCONS (clause)->cdr); | |
319 | break; | |
320 | } | |
321 | args = XCONS (args)->cdr; | |
322 | } | |
323 | UNGCPRO; | |
324 | ||
325 | return val; | |
326 | } | |
327 | ||
328 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
329 | "(progn BODY...): eval BODY forms sequentially and return value of last one.") | |
330 | (args) | |
331 | Lisp_Object args; | |
332 | { | |
333 | register Lisp_Object val, tem; | |
334 | Lisp_Object args_left; | |
335 | struct gcpro gcpro1; | |
336 | ||
337 | /* In Mocklisp code, symbols at the front of the progn arglist | |
338 | are to be bound to zero. */ | |
339 | if (!EQ (Vmocklisp_arguments, Qt)) | |
340 | { | |
341 | val = make_number (0); | |
90165123 | 342 | while (!NILP (args) && (tem = Fcar (args), SYMBOLP (tem))) |
db9f0278 JB |
343 | { |
344 | QUIT; | |
345 | specbind (tem, val), args = Fcdr (args); | |
346 | } | |
347 | } | |
348 | ||
265a9e55 | 349 | if (NILP(args)) |
db9f0278 JB |
350 | return Qnil; |
351 | ||
352 | args_left = args; | |
353 | GCPRO1 (args_left); | |
354 | ||
355 | do | |
356 | { | |
357 | val = Feval (Fcar (args_left)); | |
358 | args_left = Fcdr (args_left); | |
359 | } | |
265a9e55 | 360 | while (!NILP(args_left)); |
db9f0278 JB |
361 | |
362 | UNGCPRO; | |
363 | return val; | |
364 | } | |
365 | ||
366 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
367 | "(prog1 FIRST BODY...): eval FIRST and BODY sequentially; value from FIRST.\n\ | |
368 | The value of FIRST is saved during the evaluation of the remaining args,\n\ | |
369 | whose values are discarded.") | |
370 | (args) | |
371 | Lisp_Object args; | |
372 | { | |
373 | Lisp_Object val; | |
374 | register Lisp_Object args_left; | |
375 | struct gcpro gcpro1, gcpro2; | |
376 | register int argnum = 0; | |
377 | ||
265a9e55 | 378 | if (NILP(args)) |
db9f0278 JB |
379 | return Qnil; |
380 | ||
381 | args_left = args; | |
382 | val = Qnil; | |
383 | GCPRO2 (args, val); | |
384 | ||
385 | do | |
386 | { | |
387 | if (!(argnum++)) | |
388 | val = Feval (Fcar (args_left)); | |
389 | else | |
390 | Feval (Fcar (args_left)); | |
391 | args_left = Fcdr (args_left); | |
392 | } | |
265a9e55 | 393 | while (!NILP(args_left)); |
db9f0278 JB |
394 | |
395 | UNGCPRO; | |
396 | return val; | |
397 | } | |
398 | ||
399 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
877b578f | 400 | "(prog2 X Y BODY...): eval X, Y and BODY sequentially; value from Y.\n\ |
db9f0278 JB |
401 | The value of Y is saved during the evaluation of the remaining args,\n\ |
402 | whose values are discarded.") | |
403 | (args) | |
404 | Lisp_Object args; | |
405 | { | |
406 | Lisp_Object val; | |
407 | register Lisp_Object args_left; | |
408 | struct gcpro gcpro1, gcpro2; | |
409 | register int argnum = -1; | |
410 | ||
411 | val = Qnil; | |
412 | ||
87d238ba | 413 | if (NILP (args)) |
db9f0278 JB |
414 | return Qnil; |
415 | ||
416 | args_left = args; | |
417 | val = Qnil; | |
418 | GCPRO2 (args, val); | |
419 | ||
420 | do | |
421 | { | |
422 | if (!(argnum++)) | |
423 | val = Feval (Fcar (args_left)); | |
424 | else | |
425 | Feval (Fcar (args_left)); | |
426 | args_left = Fcdr (args_left); | |
427 | } | |
87d238ba | 428 | while (!NILP (args_left)); |
db9f0278 JB |
429 | |
430 | UNGCPRO; | |
431 | return val; | |
432 | } | |
433 | ||
434 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
435 | "(setq SYM VAL SYM VAL ...): set each SYM to the value of its VAL.\n\ | |
b0d75191 RS |
436 | The symbols SYM are variables; they are literal (not evaluated).\n\ |
437 | The values VAL are expressions; they are evaluated.\n\ | |
438 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.\n\ | |
439 | The second VAL is not computed until after the first SYM is set, and so on;\n\ | |
440 | each VAL can use the new value of variables set earlier in the `setq'.\n\ | |
196e7d3f | 441 | The return value of the `setq' form is the value of the last VAL.") |
db9f0278 JB |
442 | (args) |
443 | Lisp_Object args; | |
444 | { | |
445 | register Lisp_Object args_left; | |
446 | register Lisp_Object val, sym; | |
447 | struct gcpro gcpro1; | |
448 | ||
265a9e55 | 449 | if (NILP(args)) |
db9f0278 JB |
450 | return Qnil; |
451 | ||
452 | args_left = args; | |
453 | GCPRO1 (args); | |
454 | ||
455 | do | |
456 | { | |
457 | val = Feval (Fcar (Fcdr (args_left))); | |
458 | sym = Fcar (args_left); | |
459 | Fset (sym, val); | |
460 | args_left = Fcdr (Fcdr (args_left)); | |
461 | } | |
265a9e55 | 462 | while (!NILP(args_left)); |
db9f0278 JB |
463 | |
464 | UNGCPRO; | |
465 | return val; | |
466 | } | |
467 | ||
468 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, | |
469 | "Return the argument, without evaluating it. `(quote x)' yields `x'.") | |
470 | (args) | |
471 | Lisp_Object args; | |
472 | { | |
473 | return Fcar (args); | |
474 | } | |
475 | ||
476 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, | |
477 | "Like `quote', but preferred for objects which are functions.\n\ | |
478 | In byte compilation, `function' causes its argument to be compiled.\n\ | |
479 | `quote' cannot do that.") | |
480 | (args) | |
481 | Lisp_Object args; | |
482 | { | |
483 | return Fcar (args); | |
484 | } | |
485 | ||
486 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, | |
487 | "Return t if function in which this appears was called interactively.\n\ | |
488 | This means that the function was called with call-interactively (which\n\ | |
489 | includes being called as the binding of a key)\n\ | |
490 | and input is currently coming from the keyboard (not in keyboard macro).") | |
491 | () | |
492 | { | |
493 | register struct backtrace *btp; | |
494 | register Lisp_Object fun; | |
495 | ||
496 | if (!INTERACTIVE) | |
497 | return Qnil; | |
498 | ||
db9f0278 | 499 | btp = backtrace_list; |
daa37602 JB |
500 | |
501 | /* If this isn't a byte-compiled function, there may be a frame at | |
502 | the top for Finteractive_p itself. If so, skip it. */ | |
503 | fun = Findirect_function (*btp->function); | |
0598f773 | 504 | if (SUBRP (fun) && XSUBR (fun) == &Sinteractive_p) |
db9f0278 | 505 | btp = btp->next; |
daa37602 JB |
506 | |
507 | /* If we're running an Emacs 18-style byte-compiled function, there | |
508 | may be a frame for Fbytecode. Now, given the strictest | |
509 | definition, this function isn't really being called | |
510 | interactively, but because that's the way Emacs 18 always builds | |
511 | byte-compiled functions, we'll accept it for now. */ | |
512 | if (EQ (*btp->function, Qbytecode)) | |
513 | btp = btp->next; | |
514 | ||
515 | /* If this isn't a byte-compiled function, then we may now be | |
516 | looking at several frames for special forms. Skip past them. */ | |
517 | while (btp && | |
518 | btp->nargs == UNEVALLED) | |
a6e3fa71 JB |
519 | btp = btp->next; |
520 | ||
daa37602 JB |
521 | /* btp now points at the frame of the innermost function that isn't |
522 | a special form, ignoring frames for Finteractive_p and/or | |
523 | Fbytecode at the top. If this frame is for a built-in function | |
524 | (such as load or eval-region) return nil. */ | |
ffd56f97 | 525 | fun = Findirect_function (*btp->function); |
90165123 | 526 | if (SUBRP (fun)) |
db9f0278 JB |
527 | return Qnil; |
528 | /* btp points to the frame of a Lisp function that called interactive-p. | |
529 | Return t if that function was called interactively. */ | |
530 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
531 | return Qt; | |
532 | return Qnil; | |
533 | } | |
534 | ||
535 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, | |
536 | "(defun NAME ARGLIST [DOCSTRING] BODY...): define NAME as a function.\n\ | |
537 | The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
538 | See also the function `interactive'.") | |
539 | (args) | |
540 | Lisp_Object args; | |
541 | { | |
542 | register Lisp_Object fn_name; | |
543 | register Lisp_Object defn; | |
544 | ||
545 | fn_name = Fcar (args); | |
546 | defn = Fcons (Qlambda, Fcdr (args)); | |
265a9e55 | 547 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
548 | defn = Fpurecopy (defn); |
549 | Ffset (fn_name, defn); | |
2a49b6e5 | 550 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
551 | return fn_name; |
552 | } | |
553 | ||
554 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
555 | "(defmacro NAME ARGLIST [DOCSTRING] BODY...): define NAME as a macro.\n\ | |
556 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
557 | When the macro is called, as in (NAME ARGS...),\n\ | |
558 | the function (lambda ARGLIST BODY...) is applied to\n\ | |
559 | the list ARGS... as it appears in the expression,\n\ | |
560 | and the result should be a form to be evaluated instead of the original.") | |
561 | (args) | |
562 | Lisp_Object args; | |
563 | { | |
564 | register Lisp_Object fn_name; | |
565 | register Lisp_Object defn; | |
566 | ||
567 | fn_name = Fcar (args); | |
568 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); | |
265a9e55 | 569 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
570 | defn = Fpurecopy (defn); |
571 | Ffset (fn_name, defn); | |
2a49b6e5 | 572 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
573 | return fn_name; |
574 | } | |
575 | ||
576 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, | |
577 | "(defvar SYMBOL INITVALUE DOCSTRING): define SYMBOL as a variable.\n\ | |
578 | You are not required to define a variable in order to use it,\n\ | |
579 | but the definition can supply documentation and an initial value\n\ | |
580 | in a way that tags can recognize.\n\n\ | |
581 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\ | |
06ef7355 RS |
582 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
583 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
584 | INITVALUE and DOCSTRING are optional.\n\ |
585 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
586 | This means that M-x set-variable and M-x edit-options recognize it.\n\ | |
587 | If INITVALUE is missing, SYMBOL's value is not set.") | |
588 | (args) | |
589 | Lisp_Object args; | |
590 | { | |
a42ba017 | 591 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
592 | |
593 | sym = Fcar (args); | |
a42ba017 RS |
594 | tail = Fcdr (args); |
595 | if (!NILP (Fcdr (Fcdr (tail)))) | |
596 | error ("too many arguments"); | |
597 | ||
598 | if (!NILP (tail)) | |
db9f0278 JB |
599 | { |
600 | tem = Fdefault_boundp (sym); | |
265a9e55 | 601 | if (NILP (tem)) |
db9f0278 JB |
602 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
603 | } | |
a42ba017 RS |
604 | tail = Fcdr (Fcdr (args)); |
605 | if (!NILP (Fcar (tail))) | |
db9f0278 | 606 | { |
ca248607 | 607 | tem = Fcar (tail); |
265a9e55 | 608 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
609 | tem = Fpurecopy (tem); |
610 | Fput (sym, Qvariable_documentation, tem); | |
611 | } | |
2a49b6e5 | 612 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
613 | return sym; |
614 | } | |
615 | ||
616 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
617 | "(defconst SYMBOL INITVALUE DOCSTRING): define SYMBOL as a constant variable.\n\ | |
618 | The intent is that programs do not change this value, but users may.\n\ | |
619 | Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\ | |
06ef7355 RS |
620 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
621 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
622 | DOCSTRING is optional.\n\ |
623 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
624 | This means that M-x set-variable and M-x edit-options recognize it.\n\n\ | |
625 | Note: do not use `defconst' for user options in libraries that are not\n\ | |
626 | normally loaded, since it is useful for users to be able to specify\n\ | |
627 | their own values for such variables before loading the library.\n\ | |
628 | Since `defconst' unconditionally assigns the variable,\n\ | |
629 | it would override the user's choice.") | |
630 | (args) | |
631 | Lisp_Object args; | |
632 | { | |
633 | register Lisp_Object sym, tem; | |
634 | ||
635 | sym = Fcar (args); | |
a42ba017 RS |
636 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
637 | error ("too many arguments"); | |
638 | ||
db9f0278 JB |
639 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
640 | tem = Fcar (Fcdr (Fcdr (args))); | |
265a9e55 | 641 | if (!NILP (tem)) |
db9f0278 | 642 | { |
265a9e55 | 643 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
644 | tem = Fpurecopy (tem); |
645 | Fput (sym, Qvariable_documentation, tem); | |
646 | } | |
2a49b6e5 | 647 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
648 | return sym; |
649 | } | |
650 | ||
651 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, | |
652 | "Returns t if VARIABLE is intended to be set and modified by users.\n\ | |
653 | \(The alternative is a variable used internally in a Lisp program.)\n\ | |
654 | Determined by whether the first character of the documentation\n\ | |
65411977 | 655 | for the variable is `*'.") |
db9f0278 JB |
656 | (variable) |
657 | Lisp_Object variable; | |
658 | { | |
659 | Lisp_Object documentation; | |
660 | ||
5e78e475 RS |
661 | if (!SYMBOLP (variable)) |
662 | return Qnil; | |
663 | ||
db9f0278 | 664 | documentation = Fget (variable, Qvariable_documentation); |
90165123 | 665 | if (INTEGERP (documentation) && XINT (documentation) < 0) |
db9f0278 | 666 | return Qt; |
65411977 RS |
667 | if (STRINGP (documentation) |
668 | && ((unsigned char) XSTRING (documentation)->data[0] == '*')) | |
669 | return Qt; | |
670 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
671 | if (CONSP (documentation) | |
672 | && STRINGP (XCONS (documentation)->car) | |
673 | && INTEGERP (XCONS (documentation)->cdr) | |
674 | && XINT (XCONS (documentation)->cdr) < 0) | |
db9f0278 JB |
675 | return Qt; |
676 | return Qnil; | |
677 | } | |
678 | \f | |
679 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
680 | "(let* VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
681 | The value of the last form in BODY is returned.\n\ | |
682 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
683 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
684 | Each VALUEFORM can refer to the symbols already bound by this VARLIST.") | |
685 | (args) | |
686 | Lisp_Object args; | |
687 | { | |
688 | Lisp_Object varlist, val, elt; | |
689 | int count = specpdl_ptr - specpdl; | |
690 | struct gcpro gcpro1, gcpro2, gcpro3; | |
691 | ||
692 | GCPRO3 (args, elt, varlist); | |
693 | ||
694 | varlist = Fcar (args); | |
265a9e55 | 695 | while (!NILP (varlist)) |
db9f0278 JB |
696 | { |
697 | QUIT; | |
698 | elt = Fcar (varlist); | |
90165123 | 699 | if (SYMBOLP (elt)) |
db9f0278 | 700 | specbind (elt, Qnil); |
08564963 JB |
701 | else if (! NILP (Fcdr (Fcdr (elt)))) |
702 | Fsignal (Qerror, | |
703 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
704 | elt)); | |
db9f0278 JB |
705 | else |
706 | { | |
707 | val = Feval (Fcar (Fcdr (elt))); | |
708 | specbind (Fcar (elt), val); | |
709 | } | |
710 | varlist = Fcdr (varlist); | |
711 | } | |
712 | UNGCPRO; | |
713 | val = Fprogn (Fcdr (args)); | |
714 | return unbind_to (count, val); | |
715 | } | |
716 | ||
717 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
718 | "(let VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
719 | The value of the last form in BODY is returned.\n\ | |
720 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
721 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
722 | All the VALUEFORMs are evalled before any symbols are bound.") | |
723 | (args) | |
724 | Lisp_Object args; | |
725 | { | |
726 | Lisp_Object *temps, tem; | |
727 | register Lisp_Object elt, varlist; | |
728 | int count = specpdl_ptr - specpdl; | |
729 | register int argnum; | |
730 | struct gcpro gcpro1, gcpro2; | |
731 | ||
732 | varlist = Fcar (args); | |
733 | ||
734 | /* Make space to hold the values to give the bound variables */ | |
735 | elt = Flength (varlist); | |
736 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
737 | ||
738 | /* Compute the values and store them in `temps' */ | |
739 | ||
740 | GCPRO2 (args, *temps); | |
741 | gcpro2.nvars = 0; | |
742 | ||
265a9e55 | 743 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
744 | { |
745 | QUIT; | |
746 | elt = Fcar (varlist); | |
90165123 | 747 | if (SYMBOLP (elt)) |
db9f0278 | 748 | temps [argnum++] = Qnil; |
08564963 JB |
749 | else if (! NILP (Fcdr (Fcdr (elt)))) |
750 | Fsignal (Qerror, | |
751 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
752 | elt)); | |
db9f0278 JB |
753 | else |
754 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
755 | gcpro2.nvars = argnum; | |
756 | } | |
757 | UNGCPRO; | |
758 | ||
759 | varlist = Fcar (args); | |
265a9e55 | 760 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
761 | { |
762 | elt = Fcar (varlist); | |
763 | tem = temps[argnum++]; | |
90165123 | 764 | if (SYMBOLP (elt)) |
db9f0278 JB |
765 | specbind (elt, tem); |
766 | else | |
767 | specbind (Fcar (elt), tem); | |
768 | } | |
769 | ||
770 | elt = Fprogn (Fcdr (args)); | |
771 | return unbind_to (count, elt); | |
772 | } | |
773 | ||
774 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
775 | "(while TEST BODY...): if TEST yields non-nil, eval BODY... and repeat.\n\ | |
776 | The order of execution is thus TEST, BODY, TEST, BODY and so on\n\ | |
777 | until TEST returns nil.") | |
778 | (args) | |
779 | Lisp_Object args; | |
780 | { | |
781 | Lisp_Object test, body, tem; | |
782 | struct gcpro gcpro1, gcpro2; | |
783 | ||
784 | GCPRO2 (test, body); | |
785 | ||
786 | test = Fcar (args); | |
787 | body = Fcdr (args); | |
e3c24a74 RS |
788 | while (tem = Feval (test), |
789 | (!EQ (Vmocklisp_arguments, Qt) ? XINT (tem) : !NILP (tem))) | |
db9f0278 JB |
790 | { |
791 | QUIT; | |
792 | Fprogn (body); | |
793 | } | |
794 | ||
795 | UNGCPRO; | |
796 | return Qnil; | |
797 | } | |
798 | ||
799 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
800 | "Return result of expanding macros at top level of FORM.\n\ | |
801 | If FORM is not a macro call, it is returned unchanged.\n\ | |
802 | Otherwise, the macro is expanded and the expansion is considered\n\ | |
803 | in place of FORM. When a non-macro-call results, it is returned.\n\n\ | |
804 | The second optional arg ENVIRONMENT species an environment of macro\n\ | |
805 | definitions to shadow the loaded ones for use in file byte-compilation.") | |
79e8bfbf | 806 | (form, environment) |
2e267a2e | 807 | Lisp_Object form; |
79e8bfbf | 808 | Lisp_Object environment; |
db9f0278 | 809 | { |
23d6b5a6 | 810 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
811 | register Lisp_Object expander, sym, def, tem; |
812 | ||
813 | while (1) | |
814 | { | |
815 | /* Come back here each time we expand a macro call, | |
816 | in case it expands into another macro call. */ | |
90165123 | 817 | if (!CONSP (form)) |
db9f0278 | 818 | break; |
23d6b5a6 JB |
819 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
820 | def = sym = XCONS (form)->car; | |
821 | tem = Qnil; | |
db9f0278 JB |
822 | /* Trace symbols aliases to other symbols |
823 | until we get a symbol that is not an alias. */ | |
90165123 | 824 | while (SYMBOLP (def)) |
db9f0278 JB |
825 | { |
826 | QUIT; | |
23d6b5a6 | 827 | sym = def; |
79e8bfbf | 828 | tem = Fassq (sym, environment); |
265a9e55 | 829 | if (NILP (tem)) |
db9f0278 JB |
830 | { |
831 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
832 | if (!EQ (def, Qunbound)) |
833 | continue; | |
db9f0278 | 834 | } |
23d6b5a6 | 835 | break; |
db9f0278 | 836 | } |
79e8bfbf | 837 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 838 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 839 | if (NILP (tem)) |
db9f0278 | 840 | { |
79e8bfbf | 841 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 842 | Look at its function definition. */ |
90165123 | 843 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
844 | /* Not defined or definition not suitable */ |
845 | break; | |
846 | if (EQ (XCONS (def)->car, Qautoload)) | |
847 | { | |
848 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 849 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 850 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
851 | /* Yes, load it and try again. */ |
852 | { | |
ca20916b RS |
853 | struct gcpro gcpro1; |
854 | GCPRO1 (form); | |
ee9ee63c | 855 | do_autoload (def, sym); |
ca20916b | 856 | UNGCPRO; |
ee9ee63c JB |
857 | continue; |
858 | } | |
859 | else | |
db9f0278 | 860 | break; |
db9f0278 JB |
861 | } |
862 | else if (!EQ (XCONS (def)->car, Qmacro)) | |
863 | break; | |
864 | else expander = XCONS (def)->cdr; | |
865 | } | |
866 | else | |
867 | { | |
868 | expander = XCONS (tem)->cdr; | |
265a9e55 | 869 | if (NILP (expander)) |
db9f0278 JB |
870 | break; |
871 | } | |
db9f0278 JB |
872 | form = apply1 (expander, XCONS (form)->cdr); |
873 | } | |
874 | return form; | |
875 | } | |
876 | \f | |
877 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
878 | "(catch TAG BODY...): eval BODY allowing nonlocal exits using `throw'.\n\ | |
879 | TAG is evalled to get the tag to use. Then the BODY is executed.\n\ | |
880 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\ | |
881 | If no throw happens, `catch' returns the value of the last BODY form.\n\ | |
882 | If a throw happens, it specifies the value to return from `catch'.") | |
883 | (args) | |
884 | Lisp_Object args; | |
885 | { | |
886 | register Lisp_Object tag; | |
887 | struct gcpro gcpro1; | |
888 | ||
889 | GCPRO1 (args); | |
890 | tag = Feval (Fcar (args)); | |
891 | UNGCPRO; | |
892 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
893 | } | |
894 | ||
895 | /* Set up a catch, then call C function FUNC on argument ARG. | |
896 | FUNC should return a Lisp_Object. | |
897 | This is how catches are done from within C code. */ | |
898 | ||
899 | Lisp_Object | |
900 | internal_catch (tag, func, arg) | |
901 | Lisp_Object tag; | |
902 | Lisp_Object (*func) (); | |
903 | Lisp_Object arg; | |
904 | { | |
905 | /* This structure is made part of the chain `catchlist'. */ | |
906 | struct catchtag c; | |
907 | ||
908 | /* Fill in the components of c, and put it on the list. */ | |
909 | c.next = catchlist; | |
910 | c.tag = tag; | |
911 | c.val = Qnil; | |
912 | c.backlist = backtrace_list; | |
913 | c.handlerlist = handlerlist; | |
914 | c.lisp_eval_depth = lisp_eval_depth; | |
915 | c.pdlcount = specpdl_ptr - specpdl; | |
916 | c.poll_suppress_count = poll_suppress_count; | |
917 | c.gcpro = gcprolist; | |
918 | catchlist = &c; | |
919 | ||
920 | /* Call FUNC. */ | |
921 | if (! _setjmp (c.jmp)) | |
922 | c.val = (*func) (arg); | |
923 | ||
924 | /* Throw works by a longjmp that comes right here. */ | |
925 | catchlist = c.next; | |
926 | return c.val; | |
927 | } | |
928 | ||
ba410f40 JB |
929 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
930 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 931 | |
ba410f40 JB |
932 | This is the guts Fthrow and Fsignal; they differ only in the way |
933 | they choose the catch tag to throw to. A catch tag for a | |
934 | condition-case form has a TAG of Qnil. | |
db9f0278 | 935 | |
ba410f40 JB |
936 | Before each catch is discarded, unbind all special bindings and |
937 | execute all unwind-protect clauses made above that catch. Unwind | |
938 | the handler stack as we go, so that the proper handlers are in | |
939 | effect for each unwind-protect clause we run. At the end, restore | |
940 | some static info saved in CATCH, and longjmp to the location | |
941 | specified in the | |
942 | ||
943 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
944 | |
945 | static void | |
ba410f40 | 946 | unwind_to_catch (catch, value) |
db9f0278 | 947 | struct catchtag *catch; |
ba410f40 | 948 | Lisp_Object value; |
db9f0278 JB |
949 | { |
950 | register int last_time; | |
951 | ||
ba410f40 JB |
952 | /* Save the value in the tag. */ |
953 | catch->val = value; | |
954 | ||
82da7701 | 955 | /* Restore the polling-suppression count. */ |
1cdc3155 | 956 | set_poll_suppress_count (catch->poll_suppress_count); |
82da7701 | 957 | |
db9f0278 JB |
958 | do |
959 | { | |
960 | last_time = catchlist == catch; | |
82da7701 JB |
961 | |
962 | /* Unwind the specpdl stack, and then restore the proper set of | |
963 | handlers. */ | |
db9f0278 JB |
964 | unbind_to (catchlist->pdlcount, Qnil); |
965 | handlerlist = catchlist->handlerlist; | |
966 | catchlist = catchlist->next; | |
967 | } | |
968 | while (! last_time); | |
969 | ||
970 | gcprolist = catch->gcpro; | |
971 | backtrace_list = catch->backlist; | |
972 | lisp_eval_depth = catch->lisp_eval_depth; | |
ba410f40 JB |
973 | |
974 | _longjmp (catch->jmp, 1); | |
db9f0278 JB |
975 | } |
976 | ||
977 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
978 | "(throw TAG VALUE): throw to the catch for TAG and return VALUE from it.\n\ | |
979 | Both TAG and VALUE are evalled.") | |
79e8bfbf EN |
980 | (tag, value) |
981 | register Lisp_Object tag, value; | |
db9f0278 JB |
982 | { |
983 | register struct catchtag *c; | |
984 | ||
985 | while (1) | |
986 | { | |
265a9e55 | 987 | if (!NILP (tag)) |
db9f0278 JB |
988 | for (c = catchlist; c; c = c->next) |
989 | { | |
990 | if (EQ (c->tag, tag)) | |
79e8bfbf | 991 | unwind_to_catch (c, value); |
db9f0278 | 992 | } |
79e8bfbf | 993 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (value, Qnil))); |
db9f0278 JB |
994 | } |
995 | } | |
996 | ||
997 | ||
998 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
999 | "Do BODYFORM, protecting with UNWINDFORMS.\n\ | |
1000 | Usage looks like (unwind-protect BODYFORM UNWINDFORMS...).\n\ | |
1001 | If BODYFORM completes normally, its value is returned\n\ | |
1002 | after executing the UNWINDFORMS.\n\ | |
1003 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.") | |
1004 | (args) | |
1005 | Lisp_Object args; | |
1006 | { | |
1007 | Lisp_Object val; | |
1008 | int count = specpdl_ptr - specpdl; | |
1009 | ||
1010 | record_unwind_protect (0, Fcdr (args)); | |
1011 | val = Feval (Fcar (args)); | |
1012 | return unbind_to (count, val); | |
1013 | } | |
1014 | \f | |
1015 | /* Chain of condition handlers currently in effect. | |
1016 | The elements of this chain are contained in the stack frames | |
1017 | of Fcondition_case and internal_condition_case. | |
1018 | When an error is signaled (by calling Fsignal, below), | |
1019 | this chain is searched for an element that applies. */ | |
1020 | ||
1021 | struct handler *handlerlist; | |
1022 | ||
1023 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
1024 | "Regain control when an error is signaled.\n\ | |
1025 | Usage looks like (condition-case VAR BODYFORM HANDLERS...).\n\ | |
1026 | executes BODYFORM and returns its value if no error happens.\n\ | |
1027 | Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\ | |
1028 | where the BODY is made of Lisp expressions.\n\n\ | |
1029 | A handler is applicable to an error\n\ | |
1030 | if CONDITION-NAME is one of the error's condition names.\n\ | |
1031 | If an error happens, the first applicable handler is run.\n\ | |
1032 | \n\ | |
633357d4 RS |
1033 | The car of a handler may be a list of condition names\n\ |
1034 | instead of a single condition name.\n\ | |
1035 | \n\ | |
db9f0278 JB |
1036 | When a handler handles an error,\n\ |
1037 | control returns to the condition-case and the handler BODY... is executed\n\ | |
1038 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\ | |
1039 | VAR may be nil; then you do not get access to the signal information.\n\ | |
1040 | \n\ | |
1041 | The value of the last BODY form is returned from the condition-case.\n\ | |
1042 | See also the function `signal' for more info.") | |
1043 | (args) | |
1044 | Lisp_Object args; | |
1045 | { | |
1046 | Lisp_Object val; | |
1047 | struct catchtag c; | |
1048 | struct handler h; | |
82da7701 | 1049 | register Lisp_Object var, bodyform, handlers; |
db9f0278 | 1050 | |
82da7701 JB |
1051 | var = Fcar (args); |
1052 | bodyform = Fcar (Fcdr (args)); | |
1053 | handlers = Fcdr (Fcdr (args)); | |
1054 | CHECK_SYMBOL (var, 0); | |
1055 | ||
1056 | for (val = handlers; ! NILP (val); val = Fcdr (val)) | |
1057 | { | |
1058 | Lisp_Object tem; | |
1059 | tem = Fcar (val); | |
5f96776a RS |
1060 | if (! (NILP (tem) |
1061 | || (CONSP (tem) | |
1062 | && (SYMBOLP (XCONS (tem)->car) | |
1063 | || CONSP (XCONS (tem)->car))))) | |
82da7701 JB |
1064 | error ("Invalid condition handler", tem); |
1065 | } | |
db9f0278 JB |
1066 | |
1067 | c.tag = Qnil; | |
1068 | c.val = Qnil; | |
1069 | c.backlist = backtrace_list; | |
1070 | c.handlerlist = handlerlist; | |
1071 | c.lisp_eval_depth = lisp_eval_depth; | |
1072 | c.pdlcount = specpdl_ptr - specpdl; | |
1073 | c.poll_suppress_count = poll_suppress_count; | |
1074 | c.gcpro = gcprolist; | |
1075 | if (_setjmp (c.jmp)) | |
1076 | { | |
265a9e55 | 1077 | if (!NILP (h.var)) |
9d58218c RS |
1078 | specbind (h.var, c.val); |
1079 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1080 | |
1081 | /* Note that this just undoes the binding of h.var; whoever | |
1082 | longjumped to us unwound the stack to c.pdlcount before | |
1083 | throwing. */ | |
db9f0278 JB |
1084 | unbind_to (c.pdlcount, Qnil); |
1085 | return val; | |
1086 | } | |
1087 | c.next = catchlist; | |
1088 | catchlist = &c; | |
db9f0278 | 1089 | |
82da7701 JB |
1090 | h.var = var; |
1091 | h.handler = handlers; | |
db9f0278 | 1092 | h.next = handlerlist; |
db9f0278 JB |
1093 | h.tag = &c; |
1094 | handlerlist = &h; | |
1095 | ||
82da7701 | 1096 | val = Feval (bodyform); |
db9f0278 JB |
1097 | catchlist = c.next; |
1098 | handlerlist = h.next; | |
1099 | return val; | |
1100 | } | |
1101 | ||
f029ca5f RS |
1102 | /* Call the function BFUN with no arguments, catching errors within it |
1103 | according to HANDLERS. If there is an error, call HFUN with | |
1104 | one argument which is the data that describes the error: | |
1105 | (SIGNALNAME . DATA) | |
1106 | ||
1107 | HANDLERS can be a list of conditions to catch. | |
1108 | If HANDLERS is Qt, catch all errors. | |
1109 | If HANDLERS is Qerror, catch all errors | |
1110 | but allow the debugger to run if that is enabled. */ | |
1111 | ||
db9f0278 JB |
1112 | Lisp_Object |
1113 | internal_condition_case (bfun, handlers, hfun) | |
1114 | Lisp_Object (*bfun) (); | |
1115 | Lisp_Object handlers; | |
1116 | Lisp_Object (*hfun) (); | |
1117 | { | |
1118 | Lisp_Object val; | |
1119 | struct catchtag c; | |
1120 | struct handler h; | |
1121 | ||
01591d17 RS |
1122 | /* Since Fsignal resets this to 0, it had better be 0 now |
1123 | or else we have a potential bug. */ | |
1124 | if (interrupt_input_blocked != 0) | |
1125 | abort (); | |
1126 | ||
db9f0278 JB |
1127 | c.tag = Qnil; |
1128 | c.val = Qnil; | |
1129 | c.backlist = backtrace_list; | |
1130 | c.handlerlist = handlerlist; | |
1131 | c.lisp_eval_depth = lisp_eval_depth; | |
1132 | c.pdlcount = specpdl_ptr - specpdl; | |
1133 | c.poll_suppress_count = poll_suppress_count; | |
1134 | c.gcpro = gcprolist; | |
1135 | if (_setjmp (c.jmp)) | |
1136 | { | |
9d58218c | 1137 | return (*hfun) (c.val); |
db9f0278 JB |
1138 | } |
1139 | c.next = catchlist; | |
1140 | catchlist = &c; | |
1141 | h.handler = handlers; | |
1142 | h.var = Qnil; | |
db9f0278 JB |
1143 | h.next = handlerlist; |
1144 | h.tag = &c; | |
1145 | handlerlist = &h; | |
1146 | ||
1147 | val = (*bfun) (); | |
1148 | catchlist = c.next; | |
1149 | handlerlist = h.next; | |
1150 | return val; | |
1151 | } | |
1152 | ||
f029ca5f RS |
1153 | /* Like internal_condition_case but call HFUN with ARG as its argument. */ |
1154 | ||
d227775c RS |
1155 | Lisp_Object |
1156 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1157 | Lisp_Object (*bfun) (); | |
1158 | Lisp_Object arg; | |
1159 | Lisp_Object handlers; | |
1160 | Lisp_Object (*hfun) (); | |
1161 | { | |
1162 | Lisp_Object val; | |
1163 | struct catchtag c; | |
1164 | struct handler h; | |
1165 | ||
1166 | c.tag = Qnil; | |
1167 | c.val = Qnil; | |
1168 | c.backlist = backtrace_list; | |
1169 | c.handlerlist = handlerlist; | |
1170 | c.lisp_eval_depth = lisp_eval_depth; | |
1171 | c.pdlcount = specpdl_ptr - specpdl; | |
1172 | c.poll_suppress_count = poll_suppress_count; | |
1173 | c.gcpro = gcprolist; | |
1174 | if (_setjmp (c.jmp)) | |
1175 | { | |
9d58218c | 1176 | return (*hfun) (c.val); |
d227775c RS |
1177 | } |
1178 | c.next = catchlist; | |
1179 | catchlist = &c; | |
1180 | h.handler = handlers; | |
1181 | h.var = Qnil; | |
1182 | h.next = handlerlist; | |
1183 | h.tag = &c; | |
1184 | handlerlist = &h; | |
1185 | ||
1186 | val = (*bfun) (arg); | |
1187 | catchlist = c.next; | |
1188 | handlerlist = h.next; | |
1189 | return val; | |
1190 | } | |
1191 | \f | |
db9f0278 JB |
1192 | static Lisp_Object find_handler_clause (); |
1193 | ||
1194 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
4200e719 | 1195 | "Signal an error. Args are ERROR-SYMBOL and associated DATA.\n\ |
db9f0278 | 1196 | This function does not return.\n\n\ |
4200e719 | 1197 | An error symbol is a symbol with an `error-conditions' property\n\ |
db9f0278 JB |
1198 | that is a list of condition names.\n\ |
1199 | A handler for any of those names will get to handle this signal.\n\ | |
1200 | The symbol `error' should normally be one of them.\n\ | |
1201 | \n\ | |
1202 | DATA should be a list. Its elements are printed as part of the error message.\n\ | |
1203 | If the signal is handled, DATA is made available to the handler.\n\ | |
1204 | See also the function `condition-case'.") | |
4200e719 RS |
1205 | (error_symbol, data) |
1206 | Lisp_Object error_symbol, data; | |
db9f0278 JB |
1207 | { |
1208 | register struct handler *allhandlers = handlerlist; | |
1209 | Lisp_Object conditions; | |
1210 | extern int gc_in_progress; | |
1211 | extern int waiting_for_input; | |
1212 | Lisp_Object debugger_value; | |
c11d3d17 | 1213 | Lisp_Object string; |
db9f0278 JB |
1214 | |
1215 | quit_error_check (); | |
1216 | immediate_quit = 0; | |
1217 | if (gc_in_progress || waiting_for_input) | |
1218 | abort (); | |
1219 | ||
5ae3ca1c | 1220 | #ifdef HAVE_WINDOW_SYSTEM |
db9f0278 | 1221 | TOTALLY_UNBLOCK_INPUT; |
e5d77022 | 1222 | #endif |
db9f0278 | 1223 | |
61ede770 RS |
1224 | /* This hook is used by edebug. */ |
1225 | if (! NILP (Vsignal_hook_function)) | |
f01a9c5b | 1226 | call2 (Vsignal_hook_function, error_symbol, data); |
61ede770 | 1227 | |
4200e719 | 1228 | conditions = Fget (error_symbol, Qerror_conditions); |
db9f0278 JB |
1229 | |
1230 | for (; handlerlist; handlerlist = handlerlist->next) | |
1231 | { | |
1232 | register Lisp_Object clause; | |
1233 | clause = find_handler_clause (handlerlist->handler, conditions, | |
4200e719 | 1234 | error_symbol, data, &debugger_value); |
db9f0278 JB |
1235 | |
1236 | #if 0 /* Most callers are not prepared to handle gc if this returns. | |
1237 | So, since this feature is not very useful, take it out. */ | |
1238 | /* If have called debugger and user wants to continue, | |
1239 | just return nil. */ | |
1240 | if (EQ (clause, Qlambda)) | |
1241 | return debugger_value; | |
1242 | #else | |
1243 | if (EQ (clause, Qlambda)) | |
82da7701 | 1244 | { |
690337b7 KH |
1245 | /* We can't return values to code which signaled an error, but we |
1246 | can continue code which has signaled a quit. */ | |
4200e719 | 1247 | if (EQ (error_symbol, Qquit)) |
82da7701 JB |
1248 | return Qnil; |
1249 | else | |
d3e6f8be | 1250 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1251 | } |
db9f0278 JB |
1252 | #endif |
1253 | ||
265a9e55 | 1254 | if (!NILP (clause)) |
db9f0278 | 1255 | { |
9d58218c | 1256 | Lisp_Object unwind_data; |
db9f0278 | 1257 | struct handler *h = handlerlist; |
9d58218c | 1258 | |
db9f0278 | 1259 | handlerlist = allhandlers; |
dff36a42 | 1260 | if (EQ (data, memory_signal_data)) |
9d58218c RS |
1261 | unwind_data = memory_signal_data; |
1262 | else | |
1263 | unwind_data = Fcons (error_symbol, data); | |
1264 | h->chosen_clause = clause; | |
1265 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1266 | } |
1267 | } | |
1268 | ||
1269 | handlerlist = allhandlers; | |
1270 | /* If no handler is present now, try to run the debugger, | |
1271 | and if that fails, throw to top level. */ | |
4200e719 | 1272 | find_handler_clause (Qerror, conditions, error_symbol, data, &debugger_value); |
c11d3d17 RS |
1273 | if (catchlist != 0) |
1274 | Fthrow (Qtop_level, Qt); | |
1275 | ||
1276 | if (! EQ (data, memory_signal_data)) | |
1277 | data = Fcons (error_symbol, data); | |
1278 | ||
1279 | string = Ferror_message_string (data); | |
1280 | fatal (XSTRING (string)->data, 0, 0); | |
db9f0278 JB |
1281 | } |
1282 | ||
128c0f66 RM |
1283 | /* Return nonzero iff LIST is a non-nil atom or |
1284 | a list containing one of CONDITIONS. */ | |
1285 | ||
1286 | static int | |
1287 | wants_debugger (list, conditions) | |
1288 | Lisp_Object list, conditions; | |
1289 | { | |
4de86b16 | 1290 | if (NILP (list)) |
128c0f66 RM |
1291 | return 0; |
1292 | if (! CONSP (list)) | |
1293 | return 1; | |
1294 | ||
ab67260b | 1295 | while (CONSP (conditions)) |
128c0f66 | 1296 | { |
ab67260b RS |
1297 | Lisp_Object this, tail; |
1298 | this = XCONS (conditions)->car; | |
1299 | for (tail = list; CONSP (tail); tail = XCONS (tail)->cdr) | |
1300 | if (EQ (XCONS (tail)->car, this)) | |
128c0f66 | 1301 | return 1; |
128c0f66 RM |
1302 | conditions = XCONS (conditions)->cdr; |
1303 | } | |
ab67260b | 1304 | return 0; |
128c0f66 RM |
1305 | } |
1306 | ||
fc950e09 KH |
1307 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1308 | and described by SIGNAL-DATA, should skip the debugger | |
1309 | according to debugger-ignore-errors. */ | |
1310 | ||
1311 | static int | |
1312 | skip_debugger (conditions, data) | |
1313 | Lisp_Object conditions, data; | |
1314 | { | |
1315 | Lisp_Object tail; | |
1316 | int first_string = 1; | |
1317 | Lisp_Object error_message; | |
1318 | ||
1319 | for (tail = Vdebug_ignored_errors; CONSP (tail); | |
1320 | tail = XCONS (tail)->cdr) | |
1321 | { | |
1322 | if (STRINGP (XCONS (tail)->car)) | |
1323 | { | |
1324 | if (first_string) | |
1325 | { | |
1326 | error_message = Ferror_message_string (data); | |
1327 | first_string = 0; | |
1328 | } | |
1329 | if (fast_string_match (XCONS (tail)->car, error_message) >= 0) | |
1330 | return 1; | |
1331 | } | |
1332 | else | |
1333 | { | |
1334 | Lisp_Object contail; | |
1335 | ||
1336 | for (contail = conditions; CONSP (contail); | |
1337 | contail = XCONS (contail)->cdr) | |
1338 | if (EQ (XCONS (tail)->car, XCONS (contail)->car)) | |
1339 | return 1; | |
1340 | } | |
1341 | } | |
1342 | ||
1343 | return 0; | |
1344 | } | |
1345 | ||
128c0f66 RM |
1346 | /* Value of Qlambda means we have called debugger and user has continued. |
1347 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ | |
db9f0278 JB |
1348 | |
1349 | static Lisp_Object | |
1350 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) | |
1351 | Lisp_Object handlers, conditions, sig, data; | |
1352 | Lisp_Object *debugger_value_ptr; | |
1353 | { | |
1354 | register Lisp_Object h; | |
1355 | register Lisp_Object tem; | |
db9f0278 JB |
1356 | |
1357 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ | |
1358 | return Qt; | |
61ede770 RS |
1359 | /* error is used similarly, but means print an error message |
1360 | and run the debugger if that is enabled. */ | |
1361 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1362 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1363 | there is a handler. */ | |
db9f0278 | 1364 | { |
61ede770 RS |
1365 | int count = specpdl_ptr - specpdl; |
1366 | int debugger_called = 0; | |
1367 | ||
128c0f66 | 1368 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
db9f0278 | 1369 | internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace, Qnil); |
ba410f40 JB |
1370 | if ((EQ (sig, Qquit) |
1371 | ? debug_on_quit | |
1372 | : wants_debugger (Vdebug_on_error, conditions)) | |
fc950e09 | 1373 | && ! skip_debugger (conditions, Fcons (sig, data)) |
be857679 | 1374 | && when_entered_debugger < num_nonmacro_input_events) |
db9f0278 | 1375 | { |
db9f0278 | 1376 | specbind (Qdebug_on_error, Qnil); |
fc950e09 KH |
1377 | *debugger_value_ptr |
1378 | = call_debugger (Fcons (Qerror, | |
1379 | Fcons (Fcons (sig, data), | |
1380 | Qnil))); | |
61ede770 RS |
1381 | debugger_called = 1; |
1382 | } | |
1383 | /* If there is no handler, return saying whether we ran the debugger. */ | |
1384 | if (EQ (handlers, Qerror)) | |
1385 | { | |
1386 | if (debugger_called) | |
1387 | return unbind_to (count, Qlambda); | |
1388 | return Qt; | |
db9f0278 | 1389 | } |
db9f0278 JB |
1390 | } |
1391 | for (h = handlers; CONSP (h); h = Fcdr (h)) | |
1392 | { | |
5f96776a RS |
1393 | Lisp_Object handler, condit; |
1394 | ||
1395 | handler = Fcar (h); | |
1396 | if (!CONSP (handler)) | |
db9f0278 | 1397 | continue; |
5f96776a RS |
1398 | condit = Fcar (handler); |
1399 | /* Handle a single condition name in handler HANDLER. */ | |
1400 | if (SYMBOLP (condit)) | |
1401 | { | |
1402 | tem = Fmemq (Fcar (handler), conditions); | |
1403 | if (!NILP (tem)) | |
1404 | return handler; | |
1405 | } | |
1406 | /* Handle a list of condition names in handler HANDLER. */ | |
1407 | else if (CONSP (condit)) | |
1408 | { | |
1409 | while (CONSP (condit)) | |
1410 | { | |
1411 | tem = Fmemq (Fcar (condit), conditions); | |
1412 | if (!NILP (tem)) | |
1413 | return handler; | |
1414 | condit = XCONS (condit)->cdr; | |
1415 | } | |
1416 | } | |
db9f0278 JB |
1417 | } |
1418 | return Qnil; | |
1419 | } | |
1420 | ||
1421 | /* dump an error message; called like printf */ | |
1422 | ||
1423 | /* VARARGS 1 */ | |
1424 | void | |
1425 | error (m, a1, a2, a3) | |
1426 | char *m; | |
9125da08 | 1427 | char *a1, *a2, *a3; |
db9f0278 JB |
1428 | { |
1429 | char buf[200]; | |
9125da08 RS |
1430 | int size = 200; |
1431 | int mlen; | |
1432 | char *buffer = buf; | |
1433 | char *args[3]; | |
1434 | int allocated = 0; | |
1435 | Lisp_Object string; | |
1436 | ||
1437 | args[0] = a1; | |
1438 | args[1] = a2; | |
1439 | args[2] = a3; | |
1440 | ||
1441 | mlen = strlen (m); | |
db9f0278 JB |
1442 | |
1443 | while (1) | |
9125da08 RS |
1444 | { |
1445 | int used = doprnt (buf, size, m, m + mlen, 3, args); | |
1446 | if (used < size) | |
1447 | break; | |
1448 | size *= 2; | |
1449 | if (allocated) | |
1450 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1451 | else |
1452 | { | |
1453 | buffer = (char *) xmalloc (size); | |
1454 | allocated = 1; | |
1455 | } | |
9125da08 RS |
1456 | } |
1457 | ||
1458 | string = build_string (buf); | |
1459 | if (allocated) | |
1460 | free (buffer); | |
1461 | ||
1462 | Fsignal (Qerror, Fcons (string, Qnil)); | |
db9f0278 JB |
1463 | } |
1464 | \f | |
1465 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, | |
1466 | "T if FUNCTION makes provisions for interactive calling.\n\ | |
1467 | This means it contains a description for how to read arguments to give it.\n\ | |
1468 | The value is nil for an invalid function or a symbol with no function\n\ | |
1469 | definition.\n\ | |
1470 | \n\ | |
1471 | Interactively callable functions include strings and vectors (treated\n\ | |
1472 | as keyboard macros), lambda-expressions that contain a top-level call\n\ | |
1473 | to `interactive', autoload definitions made by `autoload' with non-nil\n\ | |
1474 | fourth argument, and some of the built-in functions of Lisp.\n\ | |
1475 | \n\ | |
1476 | Also, a symbol satisfies `commandp' if its function definition does so.") | |
1477 | (function) | |
1478 | Lisp_Object function; | |
1479 | { | |
1480 | register Lisp_Object fun; | |
1481 | register Lisp_Object funcar; | |
1482 | register Lisp_Object tem; | |
1483 | register int i = 0; | |
1484 | ||
1485 | fun = function; | |
1486 | ||
ffd56f97 JB |
1487 | fun = indirect_function (fun); |
1488 | if (EQ (fun, Qunbound)) | |
1489 | return Qnil; | |
db9f0278 JB |
1490 | |
1491 | /* Emacs primitives are interactive if their DEFUN specifies an | |
1492 | interactive spec. */ | |
90165123 | 1493 | if (SUBRP (fun)) |
db9f0278 JB |
1494 | { |
1495 | if (XSUBR (fun)->prompt) | |
1496 | return Qt; | |
1497 | else | |
1498 | return Qnil; | |
1499 | } | |
1500 | ||
1501 | /* Bytecode objects are interactive if they are long enough to | |
1502 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1503 | where the interactive spec is stored. */ | |
90165123 | 1504 | else if (COMPILEDP (fun)) |
f9b4aacf | 1505 | return ((XVECTOR (fun)->size & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
db9f0278 JB |
1506 | ? Qt : Qnil); |
1507 | ||
1508 | /* Strings and vectors are keyboard macros. */ | |
90165123 | 1509 | if (STRINGP (fun) || VECTORP (fun)) |
db9f0278 JB |
1510 | return Qt; |
1511 | ||
1512 | /* Lists may represent commands. */ | |
1513 | if (!CONSP (fun)) | |
1514 | return Qnil; | |
1515 | funcar = Fcar (fun); | |
90165123 | 1516 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
1517 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
1518 | if (EQ (funcar, Qlambda)) | |
1519 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); | |
1520 | if (EQ (funcar, Qmocklisp)) | |
1521 | return Qt; /* All mocklisp functions can be called interactively */ | |
1522 | if (EQ (funcar, Qautoload)) | |
1523 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); | |
1524 | else | |
1525 | return Qnil; | |
1526 | } | |
1527 | ||
1528 | /* ARGSUSED */ | |
1529 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
1530 | "Define FUNCTION to autoload from FILE.\n\ | |
1531 | FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\ | |
1532 | Third arg DOCSTRING is documentation for the function.\n\ | |
1533 | Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\ | |
ee9ee63c JB |
1534 | Fifth arg TYPE indicates the type of the object:\n\ |
1535 | nil or omitted says FUNCTION is a function,\n\ | |
1536 | `keymap' says FUNCTION is really a keymap, and\n\ | |
1537 | `macro' or t says FUNCTION is really a macro.\n\ | |
db9f0278 JB |
1538 | Third through fifth args give info about the real definition.\n\ |
1539 | They default to nil.\n\ | |
1540 | If FUNCTION is already defined other than as an autoload,\n\ | |
1541 | this does nothing and returns nil.") | |
ee9ee63c JB |
1542 | (function, file, docstring, interactive, type) |
1543 | Lisp_Object function, file, docstring, interactive, type; | |
db9f0278 JB |
1544 | { |
1545 | #ifdef NO_ARG_ARRAY | |
1546 | Lisp_Object args[4]; | |
1547 | #endif | |
1548 | ||
1549 | CHECK_SYMBOL (function, 0); | |
1550 | CHECK_STRING (file, 1); | |
1551 | ||
1552 | /* If function is defined and not as an autoload, don't override */ | |
1553 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 1554 | && !(CONSP (XSYMBOL (function)->function) |
db9f0278 JB |
1555 | && EQ (XCONS (XSYMBOL (function)->function)->car, Qautoload))) |
1556 | return Qnil; | |
1557 | ||
1558 | #ifdef NO_ARG_ARRAY | |
1559 | args[0] = file; | |
1560 | args[1] = docstring; | |
1561 | args[2] = interactive; | |
ee9ee63c | 1562 | args[3] = type; |
db9f0278 JB |
1563 | |
1564 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
1565 | #else /* NO_ARG_ARRAY */ | |
1566 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
1567 | #endif /* not NO_ARG_ARRAY */ | |
1568 | } | |
1569 | ||
1570 | Lisp_Object | |
1571 | un_autoload (oldqueue) | |
1572 | Lisp_Object oldqueue; | |
1573 | { | |
1574 | register Lisp_Object queue, first, second; | |
1575 | ||
1576 | /* Queue to unwind is current value of Vautoload_queue. | |
1577 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1578 | queue = Vautoload_queue; | |
1579 | Vautoload_queue = oldqueue; | |
1580 | while (CONSP (queue)) | |
1581 | { | |
1582 | first = Fcar (queue); | |
1583 | second = Fcdr (first); | |
1584 | first = Fcar (first); | |
1585 | if (EQ (second, Qnil)) | |
1586 | Vfeatures = first; | |
1587 | else | |
1588 | Ffset (first, second); | |
1589 | queue = Fcdr (queue); | |
1590 | } | |
1591 | return Qnil; | |
1592 | } | |
1593 | ||
ca20916b RS |
1594 | /* Load an autoloaded function. |
1595 | FUNNAME is the symbol which is the function's name. | |
1596 | FUNDEF is the autoload definition (a list). */ | |
1597 | ||
db9f0278 JB |
1598 | do_autoload (fundef, funname) |
1599 | Lisp_Object fundef, funname; | |
1600 | { | |
1601 | int count = specpdl_ptr - specpdl; | |
2a49b6e5 | 1602 | Lisp_Object fun, val, queue, first, second; |
ca20916b | 1603 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 JB |
1604 | |
1605 | fun = funname; | |
1606 | CHECK_SYMBOL (funname, 0); | |
ca20916b | 1607 | GCPRO3 (fun, funname, fundef); |
db9f0278 JB |
1608 | |
1609 | /* Value saved here is to be restored into Vautoload_queue */ | |
1610 | record_unwind_protect (un_autoload, Vautoload_queue); | |
1611 | Vautoload_queue = Qt; | |
1612 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil); | |
2a49b6e5 RS |
1613 | |
1614 | /* Save the old autoloads, in case we ever do an unload. */ | |
1615 | queue = Vautoload_queue; | |
1616 | while (CONSP (queue)) | |
1617 | { | |
1618 | first = Fcar (queue); | |
1619 | second = Fcdr (first); | |
1620 | first = Fcar (first); | |
5739ce6b ER |
1621 | |
1622 | /* Note: This test is subtle. The cdr of an autoload-queue entry | |
1623 | may be an atom if the autoload entry was generated by a defalias | |
1624 | or fset. */ | |
1625 | if (CONSP (second)) | |
03e267c2 | 1626 | Fput (first, Qautoload, (Fcdr (second))); |
5739ce6b | 1627 | |
2a49b6e5 RS |
1628 | queue = Fcdr (queue); |
1629 | } | |
1630 | ||
db9f0278 JB |
1631 | /* Once loading finishes, don't undo it. */ |
1632 | Vautoload_queue = Qt; | |
1633 | unbind_to (count, Qnil); | |
1634 | ||
ffd56f97 JB |
1635 | fun = Findirect_function (fun); |
1636 | ||
76c2b0cc | 1637 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 JB |
1638 | error ("Autoloading failed to define function %s", |
1639 | XSYMBOL (funname)->name->data); | |
ca20916b | 1640 | UNGCPRO; |
db9f0278 JB |
1641 | } |
1642 | \f | |
1643 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
1644 | "Evaluate FORM and return its value.") | |
1645 | (form) | |
1646 | Lisp_Object form; | |
1647 | { | |
1648 | Lisp_Object fun, val, original_fun, original_args; | |
1649 | Lisp_Object funcar; | |
1650 | struct backtrace backtrace; | |
1651 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1652 | ||
90165123 | 1653 | if (SYMBOLP (form)) |
db9f0278 JB |
1654 | { |
1655 | if (EQ (Vmocklisp_arguments, Qt)) | |
1656 | return Fsymbol_value (form); | |
1657 | val = Fsymbol_value (form); | |
265a9e55 | 1658 | if (NILP (val)) |
a631e24c | 1659 | XSETFASTINT (val, 0); |
db9f0278 | 1660 | else if (EQ (val, Qt)) |
a631e24c | 1661 | XSETFASTINT (val, 1); |
db9f0278 JB |
1662 | return val; |
1663 | } | |
1664 | if (!CONSP (form)) | |
1665 | return form; | |
1666 | ||
1667 | QUIT; | |
1668 | if (consing_since_gc > gc_cons_threshold) | |
1669 | { | |
1670 | GCPRO1 (form); | |
1671 | Fgarbage_collect (); | |
1672 | UNGCPRO; | |
1673 | } | |
1674 | ||
1675 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1676 | { | |
1677 | if (max_lisp_eval_depth < 100) | |
1678 | max_lisp_eval_depth = 100; | |
1679 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1680 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1681 | } | |
1682 | ||
1683 | original_fun = Fcar (form); | |
1684 | original_args = Fcdr (form); | |
1685 | ||
1686 | backtrace.next = backtrace_list; | |
1687 | backtrace_list = &backtrace; | |
1688 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
1689 | backtrace.args = &original_args; | |
1690 | backtrace.nargs = UNEVALLED; | |
1691 | backtrace.evalargs = 1; | |
1692 | backtrace.debug_on_exit = 0; | |
1693 | ||
1694 | if (debug_on_next_call) | |
1695 | do_debug_on_call (Qt); | |
1696 | ||
1697 | /* At this point, only original_fun and original_args | |
1698 | have values that will be used below */ | |
1699 | retry: | |
ffd56f97 | 1700 | fun = Findirect_function (original_fun); |
db9f0278 | 1701 | |
90165123 | 1702 | if (SUBRP (fun)) |
db9f0278 JB |
1703 | { |
1704 | Lisp_Object numargs; | |
1705 | Lisp_Object argvals[7]; | |
1706 | Lisp_Object args_left; | |
1707 | register int i, maxargs; | |
1708 | ||
1709 | args_left = original_args; | |
1710 | numargs = Flength (args_left); | |
1711 | ||
1712 | if (XINT (numargs) < XSUBR (fun)->min_args || | |
1713 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
1714 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
1715 | ||
1716 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1717 | { | |
1718 | backtrace.evalargs = 0; | |
1719 | val = (*XSUBR (fun)->function) (args_left); | |
1720 | goto done; | |
1721 | } | |
1722 | ||
1723 | if (XSUBR (fun)->max_args == MANY) | |
1724 | { | |
1725 | /* Pass a vector of evaluated arguments */ | |
1726 | Lisp_Object *vals; | |
1727 | register int argnum = 0; | |
1728 | ||
1729 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1730 | ||
1731 | GCPRO3 (args_left, fun, fun); | |
1732 | gcpro3.var = vals; | |
1733 | gcpro3.nvars = 0; | |
1734 | ||
265a9e55 | 1735 | while (!NILP (args_left)) |
db9f0278 JB |
1736 | { |
1737 | vals[argnum++] = Feval (Fcar (args_left)); | |
1738 | args_left = Fcdr (args_left); | |
1739 | gcpro3.nvars = argnum; | |
1740 | } | |
db9f0278 JB |
1741 | |
1742 | backtrace.args = vals; | |
1743 | backtrace.nargs = XINT (numargs); | |
1744 | ||
1745 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 1746 | UNGCPRO; |
db9f0278 JB |
1747 | goto done; |
1748 | } | |
1749 | ||
1750 | GCPRO3 (args_left, fun, fun); | |
1751 | gcpro3.var = argvals; | |
1752 | gcpro3.nvars = 0; | |
1753 | ||
1754 | maxargs = XSUBR (fun)->max_args; | |
1755 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
1756 | { | |
1757 | argvals[i] = Feval (Fcar (args_left)); | |
1758 | gcpro3.nvars = ++i; | |
1759 | } | |
1760 | ||
1761 | UNGCPRO; | |
1762 | ||
1763 | backtrace.args = argvals; | |
1764 | backtrace.nargs = XINT (numargs); | |
1765 | ||
1766 | switch (i) | |
1767 | { | |
1768 | case 0: | |
1769 | val = (*XSUBR (fun)->function) (); | |
1770 | goto done; | |
1771 | case 1: | |
1772 | val = (*XSUBR (fun)->function) (argvals[0]); | |
1773 | goto done; | |
1774 | case 2: | |
1775 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
1776 | goto done; | |
1777 | case 3: | |
1778 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1779 | argvals[2]); | |
1780 | goto done; | |
1781 | case 4: | |
1782 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1783 | argvals[2], argvals[3]); | |
1784 | goto done; | |
1785 | case 5: | |
1786 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1787 | argvals[3], argvals[4]); | |
1788 | goto done; | |
1789 | case 6: | |
1790 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1791 | argvals[3], argvals[4], argvals[5]); | |
1792 | goto done; | |
15c65264 RS |
1793 | case 7: |
1794 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1795 | argvals[3], argvals[4], argvals[5], | |
1796 | argvals[6]); | |
1797 | goto done; | |
db9f0278 JB |
1798 | |
1799 | default: | |
08564963 JB |
1800 | /* Someone has created a subr that takes more arguments than |
1801 | is supported by this code. We need to either rewrite the | |
1802 | subr to use a different argument protocol, or add more | |
1803 | cases to this switch. */ | |
1804 | abort (); | |
db9f0278 JB |
1805 | } |
1806 | } | |
90165123 | 1807 | if (COMPILEDP (fun)) |
db9f0278 JB |
1808 | val = apply_lambda (fun, original_args, 1); |
1809 | else | |
1810 | { | |
1811 | if (!CONSP (fun)) | |
1812 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1813 | funcar = Fcar (fun); | |
90165123 | 1814 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
1815 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
1816 | if (EQ (funcar, Qautoload)) | |
1817 | { | |
1818 | do_autoload (fun, original_fun); | |
1819 | goto retry; | |
1820 | } | |
1821 | if (EQ (funcar, Qmacro)) | |
1822 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
1823 | else if (EQ (funcar, Qlambda)) | |
1824 | val = apply_lambda (fun, original_args, 1); | |
1825 | else if (EQ (funcar, Qmocklisp)) | |
1826 | val = ml_apply (fun, original_args); | |
1827 | else | |
1828 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1829 | } | |
1830 | done: | |
1831 | if (!EQ (Vmocklisp_arguments, Qt)) | |
1832 | { | |
265a9e55 | 1833 | if (NILP (val)) |
a631e24c | 1834 | XSETFASTINT (val, 0); |
db9f0278 | 1835 | else if (EQ (val, Qt)) |
a631e24c | 1836 | XSETFASTINT (val, 1); |
db9f0278 JB |
1837 | } |
1838 | lisp_eval_depth--; | |
1839 | if (backtrace.debug_on_exit) | |
1840 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
1841 | backtrace_list = backtrace.next; | |
1842 | return val; | |
1843 | } | |
1844 | \f | |
1845 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
1846 | "Call FUNCTION with our remaining args, using our last arg as list of args.\n\ | |
fd7fe9a1 | 1847 | Then return the value FUNCTION returns.\n\ |
db9f0278 JB |
1848 | Thus, (apply '+ 1 2 '(3 4)) returns 10.") |
1849 | (nargs, args) | |
1850 | int nargs; | |
1851 | Lisp_Object *args; | |
1852 | { | |
1853 | register int i, numargs; | |
1854 | register Lisp_Object spread_arg; | |
1855 | register Lisp_Object *funcall_args; | |
db9f0278 | 1856 | Lisp_Object fun; |
a6e3fa71 | 1857 | struct gcpro gcpro1; |
db9f0278 JB |
1858 | |
1859 | fun = args [0]; | |
1860 | funcall_args = 0; | |
1861 | spread_arg = args [nargs - 1]; | |
1862 | CHECK_LIST (spread_arg, nargs); | |
1863 | ||
1864 | numargs = XINT (Flength (spread_arg)); | |
1865 | ||
1866 | if (numargs == 0) | |
1867 | return Ffuncall (nargs - 1, args); | |
1868 | else if (numargs == 1) | |
1869 | { | |
1870 | args [nargs - 1] = XCONS (spread_arg)->car; | |
1871 | return Ffuncall (nargs, args); | |
1872 | } | |
1873 | ||
a6e3fa71 | 1874 | numargs += nargs - 2; |
db9f0278 | 1875 | |
ffd56f97 JB |
1876 | fun = indirect_function (fun); |
1877 | if (EQ (fun, Qunbound)) | |
db9f0278 | 1878 | { |
ffd56f97 JB |
1879 | /* Let funcall get the error */ |
1880 | fun = args[0]; | |
1881 | goto funcall; | |
db9f0278 JB |
1882 | } |
1883 | ||
90165123 | 1884 | if (SUBRP (fun)) |
db9f0278 JB |
1885 | { |
1886 | if (numargs < XSUBR (fun)->min_args | |
1887 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
1888 | goto funcall; /* Let funcall get the error */ | |
1889 | else if (XSUBR (fun)->max_args > numargs) | |
1890 | { | |
1891 | /* Avoid making funcall cons up a yet another new vector of arguments | |
1892 | by explicitly supplying nil's for optional values */ | |
1893 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
1894 | * sizeof (Lisp_Object)); | |
1895 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
1896 | funcall_args[++i] = Qnil; | |
a6e3fa71 JB |
1897 | GCPRO1 (*funcall_args); |
1898 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
1899 | } |
1900 | } | |
1901 | funcall: | |
1902 | /* We add 1 to numargs because funcall_args includes the | |
1903 | function itself as well as its arguments. */ | |
1904 | if (!funcall_args) | |
a6e3fa71 JB |
1905 | { |
1906 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
1907 | * sizeof (Lisp_Object)); | |
1908 | GCPRO1 (*funcall_args); | |
1909 | gcpro1.nvars = 1 + numargs; | |
1910 | } | |
1911 | ||
db9f0278 JB |
1912 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
1913 | /* Spread the last arg we got. Its first element goes in | |
1914 | the slot that it used to occupy, hence this value of I. */ | |
1915 | i = nargs - 1; | |
265a9e55 | 1916 | while (!NILP (spread_arg)) |
db9f0278 JB |
1917 | { |
1918 | funcall_args [i++] = XCONS (spread_arg)->car; | |
1919 | spread_arg = XCONS (spread_arg)->cdr; | |
1920 | } | |
a6e3fa71 JB |
1921 | |
1922 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
1923 | } |
1924 | \f | |
ff936e53 SM |
1925 | /* Run hook variables in various ways. */ |
1926 | ||
1927 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
1928 | ||
1929 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 1, MANY, 0, | |
1930 | "Run each hook in HOOKS. Major mode functions use this.\n\ | |
1931 | Each argument should be a symbol, a hook variable.\n\ | |
1932 | These symbols are processed in the order specified.\n\ | |
1933 | If a hook symbol has a non-nil value, that value may be a function\n\ | |
1934 | or a list of functions to be called to run the hook.\n\ | |
1935 | If the value is a function, it is called with no arguments.\n\ | |
1936 | If it is a list, the elements are called, in order, with no arguments.\n\ | |
1937 | \n\ | |
1938 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
1939 | not `make-local-variable'.") | |
1940 | (nargs, args) | |
1941 | int nargs; | |
1942 | Lisp_Object *args; | |
1943 | { | |
1944 | Lisp_Object hook[1]; | |
1945 | register int i; | |
1946 | ||
1947 | for (i = 0; i < nargs; i++) | |
1948 | { | |
1949 | hook[0] = args[i]; | |
1950 | run_hook_with_args (1, hook, to_completion); | |
1951 | } | |
1952 | ||
1953 | return Qnil; | |
1954 | } | |
1955 | ||
a0d76c27 EN |
1956 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
1957 | Srun_hook_with_args, 1, MANY, 0, | |
b0b667cb KH |
1958 | "Run HOOK with the specified arguments ARGS.\n\ |
1959 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil\n\ | |
1960 | value, that value may be a function or a list of functions to be\n\ | |
1961 | called to run the hook. If the value is a function, it is called with\n\ | |
1962 | the given arguments and its return value is returned. If it is a list\n\ | |
1963 | of functions, those functions are called, in order,\n\ | |
1964 | with the given arguments ARGS.\n\ | |
1965 | It is best not to depend on the value return by `run-hook-with-args',\n\ | |
1966 | as that may change.\n\ | |
1967 | \n\ | |
ff936e53 SM |
1968 | To make a hook variable buffer-local, use `make-local-hook',\n\ |
1969 | not `make-local-variable'.") | |
1970 | (nargs, args) | |
1971 | int nargs; | |
1972 | Lisp_Object *args; | |
1973 | { | |
1974 | return run_hook_with_args (nargs, args, to_completion); | |
1975 | } | |
1976 | ||
a0d76c27 EN |
1977 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
1978 | Srun_hook_with_args_until_success, 1, MANY, 0, | |
ff936e53 SM |
1979 | "Run HOOK with the specified arguments ARGS.\n\ |
1980 | HOOK should be a symbol, a hook variable. Its value should\n\ | |
1981 | be a list of functions. We call those functions, one by one,\n\ | |
1982 | passing arguments ARGS to each of them, until one of them\n\ | |
1983 | returns a non-nil value. Then we return that value.\n\ | |
1984 | If all the functions return nil, we return nil.\n\ | |
1985 | \n\ | |
1986 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
1987 | not `make-local-variable'.") | |
b0b667cb KH |
1988 | (nargs, args) |
1989 | int nargs; | |
1990 | Lisp_Object *args; | |
1991 | { | |
ff936e53 SM |
1992 | return run_hook_with_args (nargs, args, until_success); |
1993 | } | |
1994 | ||
a0d76c27 EN |
1995 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
1996 | Srun_hook_with_args_until_failure, 1, MANY, 0, | |
ff936e53 SM |
1997 | "Run HOOK with the specified arguments ARGS.\n\ |
1998 | HOOK should be a symbol, a hook variable. Its value should\n\ | |
1999 | be a list of functions. We call those functions, one by one,\n\ | |
2000 | passing arguments ARGS to each of them, until one of them\n\ | |
2001 | returns nil. Then we return nil.\n\ | |
2002 | If all the functions return non-nil, we return non-nil.\n\ | |
2003 | \n\ | |
2004 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
2005 | not `make-local-variable'.") | |
2006 | (nargs, args) | |
2007 | int nargs; | |
2008 | Lisp_Object *args; | |
2009 | { | |
2010 | return run_hook_with_args (nargs, args, until_failure); | |
2011 | } | |
2012 | ||
c933ea05 RS |
2013 | /* ARGS[0] should be a hook symbol. |
2014 | Call each of the functions in the hook value, passing each of them | |
2015 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2016 | COND specifies a condition to test after each call | |
2017 | to decide whether to stop. | |
2018 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2019 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2020 | ||
ff936e53 SM |
2021 | Lisp_Object |
2022 | run_hook_with_args (nargs, args, cond) | |
2023 | int nargs; | |
2024 | Lisp_Object *args; | |
2025 | enum run_hooks_condition cond; | |
2026 | { | |
2027 | Lisp_Object sym, val, ret; | |
c933ea05 | 2028 | struct gcpro gcpro1, gcpro2; |
b0b667cb | 2029 | |
f029ca5f RS |
2030 | /* If we are dying or still initializing, |
2031 | don't do anything--it would probably crash if we tried. */ | |
2032 | if (NILP (Vrun_hooks)) | |
2033 | return; | |
2034 | ||
b0b667cb | 2035 | sym = args[0]; |
aa681b51 | 2036 | val = find_symbol_value (sym); |
ff936e53 SM |
2037 | ret = (cond == until_failure ? Qt : Qnil); |
2038 | ||
b0b667cb | 2039 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2040 | return ret; |
b0b667cb KH |
2041 | else if (!CONSP (val) || EQ (XCONS (val)->car, Qlambda)) |
2042 | { | |
2043 | args[0] = val; | |
2044 | return Ffuncall (nargs, args); | |
2045 | } | |
2046 | else | |
2047 | { | |
cb9d21f8 RS |
2048 | GCPRO2 (sym, val); |
2049 | ||
ff936e53 SM |
2050 | for (; |
2051 | CONSP (val) && ((cond == to_completion) | |
2052 | || (cond == until_success ? NILP (ret) | |
2053 | : !NILP (ret))); | |
2054 | val = XCONS (val)->cdr) | |
b0b667cb KH |
2055 | { |
2056 | if (EQ (XCONS (val)->car, Qt)) | |
2057 | { | |
2058 | /* t indicates this hook has a local binding; | |
2059 | it means to run the global binding too. */ | |
2060 | Lisp_Object globals; | |
2061 | ||
ff936e53 SM |
2062 | for (globals = Fdefault_value (sym); |
2063 | CONSP (globals) && ((cond == to_completion) | |
2064 | || (cond == until_success ? NILP (ret) | |
2065 | : !NILP (ret))); | |
b0b667cb KH |
2066 | globals = XCONS (globals)->cdr) |
2067 | { | |
2068 | args[0] = XCONS (globals)->car; | |
77d92e05 RS |
2069 | /* In a global value, t should not occur. If it does, we |
2070 | must ignore it to avoid an endless loop. */ | |
2071 | if (!EQ (args[0], Qt)) | |
2072 | ret = Ffuncall (nargs, args); | |
b0b667cb KH |
2073 | } |
2074 | } | |
2075 | else | |
2076 | { | |
2077 | args[0] = XCONS (val)->car; | |
ff936e53 | 2078 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2079 | } |
2080 | } | |
cb9d21f8 RS |
2081 | |
2082 | UNGCPRO; | |
ff936e53 | 2083 | return ret; |
b0b667cb KH |
2084 | } |
2085 | } | |
c933ea05 RS |
2086 | |
2087 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2088 | present value of that symbol. | |
2089 | Call each element of FUNLIST, | |
2090 | passing each of them the rest of ARGS. | |
2091 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2092 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2093 | ||
2094 | Lisp_Object | |
2095 | run_hook_list_with_args (funlist, nargs, args) | |
2096 | Lisp_Object funlist; | |
2097 | int nargs; | |
2098 | Lisp_Object *args; | |
2099 | { | |
2100 | Lisp_Object sym; | |
2101 | Lisp_Object val; | |
2102 | struct gcpro gcpro1, gcpro2; | |
2103 | ||
2104 | sym = args[0]; | |
2105 | GCPRO2 (sym, val); | |
2106 | ||
2107 | for (val = funlist; CONSP (val); val = XCONS (val)->cdr) | |
2108 | { | |
2109 | if (EQ (XCONS (val)->car, Qt)) | |
2110 | { | |
2111 | /* t indicates this hook has a local binding; | |
2112 | it means to run the global binding too. */ | |
2113 | Lisp_Object globals; | |
2114 | ||
2115 | for (globals = Fdefault_value (sym); | |
2116 | CONSP (globals); | |
2117 | globals = XCONS (globals)->cdr) | |
2118 | { | |
2119 | args[0] = XCONS (globals)->car; | |
77d92e05 RS |
2120 | /* In a global value, t should not occur. If it does, we |
2121 | must ignore it to avoid an endless loop. */ | |
2122 | if (!EQ (args[0], Qt)) | |
2123 | Ffuncall (nargs, args); | |
c933ea05 RS |
2124 | } |
2125 | } | |
2126 | else | |
2127 | { | |
2128 | args[0] = XCONS (val)->car; | |
2129 | Ffuncall (nargs, args); | |
2130 | } | |
2131 | } | |
2132 | UNGCPRO; | |
2133 | return Qnil; | |
2134 | } | |
7d48558f RS |
2135 | |
2136 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2137 | ||
2138 | void | |
2139 | run_hook_with_args_2 (hook, arg1, arg2) | |
2140 | Lisp_Object hook, arg1, arg2; | |
2141 | { | |
2142 | Lisp_Object temp[3]; | |
2143 | temp[0] = hook; | |
2144 | temp[1] = arg1; | |
2145 | temp[2] = arg2; | |
2146 | ||
2147 | Frun_hook_with_args (3, temp); | |
2148 | } | |
ff936e53 | 2149 | \f |
db9f0278 JB |
2150 | /* Apply fn to arg */ |
2151 | Lisp_Object | |
2152 | apply1 (fn, arg) | |
2153 | Lisp_Object fn, arg; | |
2154 | { | |
a6e3fa71 JB |
2155 | struct gcpro gcpro1; |
2156 | ||
2157 | GCPRO1 (fn); | |
265a9e55 | 2158 | if (NILP (arg)) |
a6e3fa71 JB |
2159 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2160 | gcpro1.nvars = 2; | |
db9f0278 JB |
2161 | #ifdef NO_ARG_ARRAY |
2162 | { | |
2163 | Lisp_Object args[2]; | |
2164 | args[0] = fn; | |
2165 | args[1] = arg; | |
a6e3fa71 JB |
2166 | gcpro1.var = args; |
2167 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
2168 | } |
2169 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 2170 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
2171 | #endif /* not NO_ARG_ARRAY */ |
2172 | } | |
2173 | ||
2174 | /* Call function fn on no arguments */ | |
2175 | Lisp_Object | |
2176 | call0 (fn) | |
2177 | Lisp_Object fn; | |
2178 | { | |
a6e3fa71 JB |
2179 | struct gcpro gcpro1; |
2180 | ||
2181 | GCPRO1 (fn); | |
2182 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2183 | } |
2184 | ||
15285f9f | 2185 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2186 | /* ARGSUSED */ |
2187 | Lisp_Object | |
15285f9f RS |
2188 | call1 (fn, arg1) |
2189 | Lisp_Object fn, arg1; | |
db9f0278 | 2190 | { |
a6e3fa71 | 2191 | struct gcpro gcpro1; |
db9f0278 | 2192 | #ifdef NO_ARG_ARRAY |
a6e3fa71 JB |
2193 | Lisp_Object args[2]; |
2194 | ||
db9f0278 | 2195 | args[0] = fn; |
15285f9f | 2196 | args[1] = arg1; |
a6e3fa71 JB |
2197 | GCPRO1 (args[0]); |
2198 | gcpro1.nvars = 2; | |
2199 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 2200 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2201 | GCPRO1 (fn); |
2202 | gcpro1.nvars = 2; | |
2203 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
2204 | #endif /* not NO_ARG_ARRAY */ |
2205 | } | |
2206 | ||
15285f9f | 2207 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2208 | /* ARGSUSED */ |
2209 | Lisp_Object | |
15285f9f RS |
2210 | call2 (fn, arg1, arg2) |
2211 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2212 | { |
a6e3fa71 | 2213 | struct gcpro gcpro1; |
db9f0278 JB |
2214 | #ifdef NO_ARG_ARRAY |
2215 | Lisp_Object args[3]; | |
2216 | args[0] = fn; | |
15285f9f RS |
2217 | args[1] = arg1; |
2218 | args[2] = arg2; | |
a6e3fa71 JB |
2219 | GCPRO1 (args[0]); |
2220 | gcpro1.nvars = 3; | |
2221 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 2222 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2223 | GCPRO1 (fn); |
2224 | gcpro1.nvars = 3; | |
2225 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
2226 | #endif /* not NO_ARG_ARRAY */ |
2227 | } | |
2228 | ||
15285f9f | 2229 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2230 | /* ARGSUSED */ |
2231 | Lisp_Object | |
15285f9f RS |
2232 | call3 (fn, arg1, arg2, arg3) |
2233 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2234 | { |
a6e3fa71 | 2235 | struct gcpro gcpro1; |
db9f0278 JB |
2236 | #ifdef NO_ARG_ARRAY |
2237 | Lisp_Object args[4]; | |
2238 | args[0] = fn; | |
15285f9f RS |
2239 | args[1] = arg1; |
2240 | args[2] = arg2; | |
2241 | args[3] = arg3; | |
a6e3fa71 JB |
2242 | GCPRO1 (args[0]); |
2243 | gcpro1.nvars = 4; | |
2244 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 2245 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2246 | GCPRO1 (fn); |
2247 | gcpro1.nvars = 4; | |
2248 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
2249 | #endif /* not NO_ARG_ARRAY */ |
2250 | } | |
2251 | ||
15285f9f | 2252 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2253 | /* ARGSUSED */ |
2254 | Lisp_Object | |
15285f9f RS |
2255 | call4 (fn, arg1, arg2, arg3, arg4) |
2256 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
2257 | { |
2258 | struct gcpro gcpro1; | |
2259 | #ifdef NO_ARG_ARRAY | |
2260 | Lisp_Object args[5]; | |
2261 | args[0] = fn; | |
15285f9f RS |
2262 | args[1] = arg1; |
2263 | args[2] = arg2; | |
2264 | args[3] = arg3; | |
2265 | args[4] = arg4; | |
a5a44b91 JB |
2266 | GCPRO1 (args[0]); |
2267 | gcpro1.nvars = 5; | |
2268 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
2269 | #else /* not NO_ARG_ARRAY */ | |
2270 | GCPRO1 (fn); | |
2271 | gcpro1.nvars = 5; | |
2272 | RETURN_UNGCPRO (Ffuncall (5, &fn)); | |
2273 | #endif /* not NO_ARG_ARRAY */ | |
2274 | } | |
2275 | ||
15285f9f RS |
2276 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2277 | /* ARGSUSED */ | |
2278 | Lisp_Object | |
2279 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
2280 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
2281 | { | |
2282 | struct gcpro gcpro1; | |
2283 | #ifdef NO_ARG_ARRAY | |
2284 | Lisp_Object args[6]; | |
2285 | args[0] = fn; | |
2286 | args[1] = arg1; | |
2287 | args[2] = arg2; | |
2288 | args[3] = arg3; | |
2289 | args[4] = arg4; | |
2290 | args[5] = arg5; | |
2291 | GCPRO1 (args[0]); | |
2292 | gcpro1.nvars = 6; | |
2293 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
2294 | #else /* not NO_ARG_ARRAY */ | |
2295 | GCPRO1 (fn); | |
2296 | gcpro1.nvars = 6; | |
2297 | RETURN_UNGCPRO (Ffuncall (6, &fn)); | |
2298 | #endif /* not NO_ARG_ARRAY */ | |
2299 | } | |
2300 | ||
2301 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2302 | /* ARGSUSED */ | |
2303 | Lisp_Object | |
2304 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
2305 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
2306 | { | |
2307 | struct gcpro gcpro1; | |
2308 | #ifdef NO_ARG_ARRAY | |
2309 | Lisp_Object args[7]; | |
2310 | args[0] = fn; | |
2311 | args[1] = arg1; | |
2312 | args[2] = arg2; | |
2313 | args[3] = arg3; | |
2314 | args[4] = arg4; | |
2315 | args[5] = arg5; | |
2316 | args[6] = arg6; | |
2317 | GCPRO1 (args[0]); | |
2318 | gcpro1.nvars = 7; | |
2319 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
2320 | #else /* not NO_ARG_ARRAY */ | |
2321 | GCPRO1 (fn); | |
2322 | gcpro1.nvars = 7; | |
2323 | RETURN_UNGCPRO (Ffuncall (7, &fn)); | |
2324 | #endif /* not NO_ARG_ARRAY */ | |
2325 | } | |
2326 | ||
db9f0278 JB |
2327 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
2328 | "Call first argument as a function, passing remaining arguments to it.\n\ | |
fd7fe9a1 | 2329 | Return the value that function returns.\n\ |
db9f0278 JB |
2330 | Thus, (funcall 'cons 'x 'y) returns (x . y).") |
2331 | (nargs, args) | |
2332 | int nargs; | |
2333 | Lisp_Object *args; | |
2334 | { | |
2335 | Lisp_Object fun; | |
2336 | Lisp_Object funcar; | |
2337 | int numargs = nargs - 1; | |
2338 | Lisp_Object lisp_numargs; | |
2339 | Lisp_Object val; | |
2340 | struct backtrace backtrace; | |
2341 | register Lisp_Object *internal_args; | |
2342 | register int i; | |
2343 | ||
2344 | QUIT; | |
2345 | if (consing_since_gc > gc_cons_threshold) | |
a6e3fa71 | 2346 | Fgarbage_collect (); |
db9f0278 JB |
2347 | |
2348 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2349 | { | |
2350 | if (max_lisp_eval_depth < 100) | |
2351 | max_lisp_eval_depth = 100; | |
2352 | if (lisp_eval_depth > max_lisp_eval_depth) | |
2353 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
2354 | } | |
2355 | ||
2356 | backtrace.next = backtrace_list; | |
2357 | backtrace_list = &backtrace; | |
2358 | backtrace.function = &args[0]; | |
2359 | backtrace.args = &args[1]; | |
2360 | backtrace.nargs = nargs - 1; | |
2361 | backtrace.evalargs = 0; | |
2362 | backtrace.debug_on_exit = 0; | |
2363 | ||
2364 | if (debug_on_next_call) | |
2365 | do_debug_on_call (Qlambda); | |
2366 | ||
2367 | retry: | |
2368 | ||
2369 | fun = args[0]; | |
ffd56f97 JB |
2370 | |
2371 | fun = Findirect_function (fun); | |
db9f0278 | 2372 | |
90165123 | 2373 | if (SUBRP (fun)) |
db9f0278 JB |
2374 | { |
2375 | if (numargs < XSUBR (fun)->min_args | |
2376 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2377 | { | |
a631e24c | 2378 | XSETFASTINT (lisp_numargs, numargs); |
db9f0278 JB |
2379 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); |
2380 | } | |
2381 | ||
2382 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2383 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2384 | ||
2385 | if (XSUBR (fun)->max_args == MANY) | |
2386 | { | |
2387 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
2388 | goto done; | |
2389 | } | |
2390 | ||
2391 | if (XSUBR (fun)->max_args > numargs) | |
2392 | { | |
2393 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2394 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
2395 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2396 | internal_args[i] = Qnil; | |
2397 | } | |
2398 | else | |
2399 | internal_args = args + 1; | |
2400 | switch (XSUBR (fun)->max_args) | |
2401 | { | |
2402 | case 0: | |
2403 | val = (*XSUBR (fun)->function) (); | |
2404 | goto done; | |
2405 | case 1: | |
2406 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
2407 | goto done; | |
2408 | case 2: | |
2409 | val = (*XSUBR (fun)->function) (internal_args[0], | |
2410 | internal_args[1]); | |
2411 | goto done; | |
2412 | case 3: | |
2413 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2414 | internal_args[2]); | |
2415 | goto done; | |
2416 | case 4: | |
2417 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2418 | internal_args[2], | |
2419 | internal_args[3]); | |
2420 | goto done; | |
2421 | case 5: | |
2422 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2423 | internal_args[2], internal_args[3], | |
2424 | internal_args[4]); | |
2425 | goto done; | |
2426 | case 6: | |
2427 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2428 | internal_args[2], internal_args[3], | |
2429 | internal_args[4], internal_args[5]); | |
2430 | goto done; | |
15c65264 RS |
2431 | case 7: |
2432 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2433 | internal_args[2], internal_args[3], | |
2434 | internal_args[4], internal_args[5], | |
2435 | internal_args[6]); | |
2436 | goto done; | |
db9f0278 JB |
2437 | |
2438 | default: | |
70ee42f7 JB |
2439 | |
2440 | /* If a subr takes more than 6 arguments without using MANY | |
2441 | or UNEVALLED, we need to extend this function to support it. | |
2442 | Until this is done, there is no way to call the function. */ | |
2443 | abort (); | |
db9f0278 JB |
2444 | } |
2445 | } | |
90165123 | 2446 | if (COMPILEDP (fun)) |
db9f0278 JB |
2447 | val = funcall_lambda (fun, numargs, args + 1); |
2448 | else | |
2449 | { | |
2450 | if (!CONSP (fun)) | |
2451 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2452 | funcar = Fcar (fun); | |
90165123 | 2453 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2454 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2455 | if (EQ (funcar, Qlambda)) | |
2456 | val = funcall_lambda (fun, numargs, args + 1); | |
2457 | else if (EQ (funcar, Qmocklisp)) | |
2458 | val = ml_apply (fun, Flist (numargs, args + 1)); | |
2459 | else if (EQ (funcar, Qautoload)) | |
2460 | { | |
2461 | do_autoload (fun, args[0]); | |
2462 | goto retry; | |
2463 | } | |
2464 | else | |
2465 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2466 | } | |
2467 | done: | |
2468 | lisp_eval_depth--; | |
2469 | if (backtrace.debug_on_exit) | |
2470 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2471 | backtrace_list = backtrace.next; | |
2472 | return val; | |
2473 | } | |
2474 | \f | |
2475 | Lisp_Object | |
2476 | apply_lambda (fun, args, eval_flag) | |
2477 | Lisp_Object fun, args; | |
2478 | int eval_flag; | |
2479 | { | |
2480 | Lisp_Object args_left; | |
2481 | Lisp_Object numargs; | |
2482 | register Lisp_Object *arg_vector; | |
2483 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2484 | register int i; | |
2485 | register Lisp_Object tem; | |
2486 | ||
2487 | numargs = Flength (args); | |
2488 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2489 | args_left = args; | |
2490 | ||
2491 | GCPRO3 (*arg_vector, args_left, fun); | |
2492 | gcpro1.nvars = 0; | |
2493 | ||
2494 | for (i = 0; i < XINT (numargs);) | |
2495 | { | |
2496 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
2497 | if (eval_flag) tem = Feval (tem); | |
2498 | arg_vector[i++] = tem; | |
2499 | gcpro1.nvars = i; | |
2500 | } | |
2501 | ||
2502 | UNGCPRO; | |
2503 | ||
2504 | if (eval_flag) | |
2505 | { | |
2506 | backtrace_list->args = arg_vector; | |
2507 | backtrace_list->nargs = i; | |
2508 | } | |
2509 | backtrace_list->evalargs = 0; | |
2510 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
2511 | ||
2512 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2513 | if (backtrace_list->debug_on_exit) | |
2514 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
2515 | /* Don't do it again when we return to eval. */ | |
2516 | backtrace_list->debug_on_exit = 0; | |
2517 | return tem; | |
2518 | } | |
2519 | ||
2520 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2521 | and return the result of evaluation. | |
2522 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2523 | ||
2524 | Lisp_Object | |
2525 | funcall_lambda (fun, nargs, arg_vector) | |
2526 | Lisp_Object fun; | |
2527 | int nargs; | |
2528 | register Lisp_Object *arg_vector; | |
2529 | { | |
2530 | Lisp_Object val, tem; | |
2531 | register Lisp_Object syms_left; | |
2532 | Lisp_Object numargs; | |
2533 | register Lisp_Object next; | |
2534 | int count = specpdl_ptr - specpdl; | |
2535 | register int i; | |
2536 | int optional = 0, rest = 0; | |
2537 | ||
2538 | specbind (Qmocklisp_arguments, Qt); /* t means NOT mocklisp! */ | |
2539 | ||
a631e24c | 2540 | XSETFASTINT (numargs, nargs); |
db9f0278 | 2541 | |
90165123 | 2542 | if (CONSP (fun)) |
db9f0278 | 2543 | syms_left = Fcar (Fcdr (fun)); |
90165123 | 2544 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2545 | syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST]; |
2546 | else abort (); | |
2547 | ||
2548 | i = 0; | |
265a9e55 | 2549 | for (; !NILP (syms_left); syms_left = Fcdr (syms_left)) |
db9f0278 JB |
2550 | { |
2551 | QUIT; | |
2552 | next = Fcar (syms_left); | |
90165123 | 2553 | while (!SYMBOLP (next)) |
9ffa21d4 | 2554 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
db9f0278 JB |
2555 | if (EQ (next, Qand_rest)) |
2556 | rest = 1; | |
2557 | else if (EQ (next, Qand_optional)) | |
2558 | optional = 1; | |
2559 | else if (rest) | |
2560 | { | |
9ffa21d4 | 2561 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
2562 | i = nargs; |
2563 | } | |
2564 | else if (i < nargs) | |
2565 | { | |
2566 | tem = arg_vector[i++]; | |
2567 | specbind (next, tem); | |
2568 | } | |
2569 | else if (!optional) | |
2570 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2571 | else | |
2572 | specbind (next, Qnil); | |
2573 | } | |
2574 | ||
2575 | if (i < nargs) | |
2576 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2577 | ||
90165123 | 2578 | if (CONSP (fun)) |
db9f0278 JB |
2579 | val = Fprogn (Fcdr (Fcdr (fun))); |
2580 | else | |
ca248607 RS |
2581 | { |
2582 | /* If we have not actually read the bytecode string | |
2583 | and constants vector yet, fetch them from the file. */ | |
2584 | if (CONSP (XVECTOR (fun)->contents[COMPILED_BYTECODE])) | |
661c7d6e | 2585 | Ffetch_bytecode (fun); |
ca248607 RS |
2586 | val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE], |
2587 | XVECTOR (fun)->contents[COMPILED_CONSTANTS], | |
2588 | XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]); | |
2589 | } | |
db9f0278 JB |
2590 | return unbind_to (count, val); |
2591 | } | |
661c7d6e KH |
2592 | |
2593 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
2594 | 1, 1, 0, | |
2595 | "If byte-compiled OBJECT is lazy-loaded, fetch it now.") | |
2596 | (object) | |
2597 | Lisp_Object object; | |
2598 | { | |
2599 | Lisp_Object tem; | |
2600 | ||
2601 | if (COMPILEDP (object) | |
2602 | && CONSP (XVECTOR (object)->contents[COMPILED_BYTECODE])) | |
2603 | { | |
2604 | tem = read_doc_string (XVECTOR (object)->contents[COMPILED_BYTECODE]); | |
5bbdb090 RS |
2605 | if (!CONSP (tem)) |
2606 | error ("invalid byte code"); | |
661c7d6e KH |
2607 | XVECTOR (object)->contents[COMPILED_BYTECODE] = XCONS (tem)->car; |
2608 | XVECTOR (object)->contents[COMPILED_CONSTANTS] = XCONS (tem)->cdr; | |
2609 | } | |
2610 | return object; | |
2611 | } | |
db9f0278 JB |
2612 | \f |
2613 | void | |
2614 | grow_specpdl () | |
2615 | { | |
2616 | register int count = specpdl_ptr - specpdl; | |
2617 | if (specpdl_size >= max_specpdl_size) | |
2618 | { | |
2619 | if (max_specpdl_size < 400) | |
2620 | max_specpdl_size = 400; | |
2621 | if (specpdl_size >= max_specpdl_size) | |
2622 | { | |
debee8fe RS |
2623 | if (!NILP (Vdebug_on_error)) |
2624 | /* Leave room for some specpdl in the debugger. */ | |
2625 | max_specpdl_size = specpdl_size + 100; | |
db9f0278 JB |
2626 | Fsignal (Qerror, |
2627 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); | |
db9f0278 JB |
2628 | } |
2629 | } | |
2630 | specpdl_size *= 2; | |
2631 | if (specpdl_size > max_specpdl_size) | |
2632 | specpdl_size = max_specpdl_size; | |
2633 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
2634 | specpdl_ptr = specpdl + count; | |
2635 | } | |
2636 | ||
2637 | void | |
2638 | specbind (symbol, value) | |
2639 | Lisp_Object symbol, value; | |
2640 | { | |
db9f0278 JB |
2641 | Lisp_Object ovalue; |
2642 | ||
9ffa21d4 JB |
2643 | CHECK_SYMBOL (symbol, 0); |
2644 | ||
db9f0278 JB |
2645 | if (specpdl_ptr == specpdl + specpdl_size) |
2646 | grow_specpdl (); | |
2647 | specpdl_ptr->symbol = symbol; | |
2648 | specpdl_ptr->func = 0; | |
d0f7cdc8 | 2649 | specpdl_ptr->old_value = ovalue = find_symbol_value (symbol); |
db9f0278 | 2650 | specpdl_ptr++; |
3d8585a1 | 2651 | if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue)) |
db9f0278 JB |
2652 | store_symval_forwarding (symbol, ovalue, value); |
2653 | else | |
ab07bca0 | 2654 | set_internal (symbol, value, 1); |
db9f0278 JB |
2655 | } |
2656 | ||
2657 | void | |
2658 | record_unwind_protect (function, arg) | |
2659 | Lisp_Object (*function)(); | |
2660 | Lisp_Object arg; | |
2661 | { | |
2662 | if (specpdl_ptr == specpdl + specpdl_size) | |
2663 | grow_specpdl (); | |
2664 | specpdl_ptr->func = function; | |
2665 | specpdl_ptr->symbol = Qnil; | |
2666 | specpdl_ptr->old_value = arg; | |
2667 | specpdl_ptr++; | |
2668 | } | |
2669 | ||
2670 | Lisp_Object | |
2671 | unbind_to (count, value) | |
2672 | int count; | |
2673 | Lisp_Object value; | |
2674 | { | |
265a9e55 | 2675 | int quitf = !NILP (Vquit_flag); |
db9f0278 JB |
2676 | struct gcpro gcpro1; |
2677 | ||
2678 | GCPRO1 (value); | |
2679 | ||
2680 | Vquit_flag = Qnil; | |
2681 | ||
2682 | while (specpdl_ptr != specpdl + count) | |
2683 | { | |
2684 | --specpdl_ptr; | |
2685 | if (specpdl_ptr->func != 0) | |
2686 | (*specpdl_ptr->func) (specpdl_ptr->old_value); | |
2687 | /* Note that a "binding" of nil is really an unwind protect, | |
2688 | so in that case the "old value" is a list of forms to evaluate. */ | |
265a9e55 | 2689 | else if (NILP (specpdl_ptr->symbol)) |
db9f0278 JB |
2690 | Fprogn (specpdl_ptr->old_value); |
2691 | else | |
ab07bca0 | 2692 | set_internal (specpdl_ptr->symbol, specpdl_ptr->old_value, 1); |
db9f0278 | 2693 | } |
265a9e55 | 2694 | if (NILP (Vquit_flag) && quitf) Vquit_flag = Qt; |
db9f0278 JB |
2695 | |
2696 | UNGCPRO; | |
2697 | ||
2698 | return value; | |
2699 | } | |
2700 | \f | |
2701 | #if 0 | |
2702 | ||
2703 | /* Get the value of symbol's global binding, even if that binding | |
2704 | is not now dynamically visible. */ | |
2705 | ||
2706 | Lisp_Object | |
2707 | top_level_value (symbol) | |
2708 | Lisp_Object symbol; | |
2709 | { | |
2710 | register struct specbinding *ptr = specpdl; | |
2711 | ||
2712 | CHECK_SYMBOL (symbol, 0); | |
2713 | for (; ptr != specpdl_ptr; ptr++) | |
2714 | { | |
2715 | if (EQ (ptr->symbol, symbol)) | |
2716 | return ptr->old_value; | |
2717 | } | |
2718 | return Fsymbol_value (symbol); | |
2719 | } | |
2720 | ||
2721 | Lisp_Object | |
2722 | top_level_set (symbol, newval) | |
2723 | Lisp_Object symbol, newval; | |
2724 | { | |
2725 | register struct specbinding *ptr = specpdl; | |
2726 | ||
2727 | CHECK_SYMBOL (symbol, 0); | |
2728 | for (; ptr != specpdl_ptr; ptr++) | |
2729 | { | |
2730 | if (EQ (ptr->symbol, symbol)) | |
2731 | { | |
2732 | ptr->old_value = newval; | |
2733 | return newval; | |
2734 | } | |
2735 | } | |
2736 | return Fset (symbol, newval); | |
2737 | } | |
2738 | ||
2739 | #endif /* 0 */ | |
2740 | \f | |
2741 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, | |
2742 | "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\ | |
2743 | The debugger is entered when that frame exits, if the flag is non-nil.") | |
2744 | (level, flag) | |
2745 | Lisp_Object level, flag; | |
2746 | { | |
2747 | register struct backtrace *backlist = backtrace_list; | |
2748 | register int i; | |
2749 | ||
2750 | CHECK_NUMBER (level, 0); | |
2751 | ||
2752 | for (i = 0; backlist && i < XINT (level); i++) | |
2753 | { | |
2754 | backlist = backlist->next; | |
2755 | } | |
2756 | ||
2757 | if (backlist) | |
265a9e55 | 2758 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
2759 | |
2760 | return flag; | |
2761 | } | |
2762 | ||
2763 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
2764 | "Print a trace of Lisp function calls currently active.\n\ | |
2765 | Output stream used is value of `standard-output'.") | |
2766 | () | |
2767 | { | |
2768 | register struct backtrace *backlist = backtrace_list; | |
2769 | register int i; | |
2770 | Lisp_Object tail; | |
2771 | Lisp_Object tem; | |
2772 | extern Lisp_Object Vprint_level; | |
2773 | struct gcpro gcpro1; | |
2774 | ||
a631e24c | 2775 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
2776 | |
2777 | tail = Qnil; | |
2778 | GCPRO1 (tail); | |
2779 | ||
2780 | while (backlist) | |
2781 | { | |
2782 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
2783 | if (backlist->nargs == UNEVALLED) | |
2784 | { | |
2785 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 2786 | write_string ("\n", -1); |
db9f0278 JB |
2787 | } |
2788 | else | |
2789 | { | |
2790 | tem = *backlist->function; | |
2791 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
2792 | write_string ("(", -1); | |
2793 | if (backlist->nargs == MANY) | |
2794 | { | |
2795 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 2796 | !NILP (tail); |
db9f0278 JB |
2797 | tail = Fcdr (tail), i++) |
2798 | { | |
2799 | if (i) write_string (" ", -1); | |
2800 | Fprin1 (Fcar (tail), Qnil); | |
2801 | } | |
2802 | } | |
2803 | else | |
2804 | { | |
2805 | for (i = 0; i < backlist->nargs; i++) | |
2806 | { | |
2807 | if (i) write_string (" ", -1); | |
2808 | Fprin1 (backlist->args[i], Qnil); | |
2809 | } | |
2810 | } | |
b6703b02 | 2811 | write_string (")\n", -1); |
db9f0278 | 2812 | } |
db9f0278 JB |
2813 | backlist = backlist->next; |
2814 | } | |
2815 | ||
2816 | Vprint_level = Qnil; | |
2817 | UNGCPRO; | |
2818 | return Qnil; | |
2819 | } | |
2820 | ||
2821 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, "", | |
79e8bfbf | 2822 | "Return the function and arguments NFRAMES up from current execution point.\n\ |
db9f0278 JB |
2823 | If that frame has not evaluated the arguments yet (or is a special form),\n\ |
2824 | the value is (nil FUNCTION ARG-FORMS...).\n\ | |
2825 | If that frame has evaluated its arguments and called its function already,\n\ | |
2826 | the value is (t FUNCTION ARG-VALUES...).\n\ | |
2827 | A &rest arg is represented as the tail of the list ARG-VALUES.\n\ | |
2828 | FUNCTION is whatever was supplied as car of evaluated list,\n\ | |
2829 | or a lambda expression for macro calls.\n\ | |
79e8bfbf | 2830 | If NFRAMES is more than the number of frames, the value is nil.") |
db9f0278 JB |
2831 | (nframes) |
2832 | Lisp_Object nframes; | |
2833 | { | |
2834 | register struct backtrace *backlist = backtrace_list; | |
2835 | register int i; | |
2836 | Lisp_Object tem; | |
2837 | ||
2838 | CHECK_NATNUM (nframes, 0); | |
2839 | ||
2840 | /* Find the frame requested. */ | |
b6703b02 | 2841 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
2842 | backlist = backlist->next; |
2843 | ||
2844 | if (!backlist) | |
2845 | return Qnil; | |
2846 | if (backlist->nargs == UNEVALLED) | |
2847 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
2848 | else | |
2849 | { | |
2850 | if (backlist->nargs == MANY) | |
2851 | tem = *backlist->args; | |
2852 | else | |
2853 | tem = Flist (backlist->nargs, backlist->args); | |
2854 | ||
2855 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
2856 | } | |
2857 | } | |
2858 | \f | |
2859 | syms_of_eval () | |
2860 | { | |
2861 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
2862 | "Limit on number of Lisp variable bindings & unwind-protects before error."); | |
2863 | ||
2864 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
2865 | "Limit on depth in `eval', `apply' and `funcall' before error.\n\ | |
2866 | This limit is to catch infinite recursions for you before they cause\n\ | |
2867 | actual stack overflow in C, which would be fatal for Emacs.\n\ | |
2868 | You can safely make it considerably larger than its default value,\n\ | |
2869 | if that proves inconveniently small."); | |
2870 | ||
2871 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
2872 | "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\ | |
d0b68896 | 2873 | Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'."); |
db9f0278 JB |
2874 | Vquit_flag = Qnil; |
2875 | ||
2876 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
2877 | "Non-nil inhibits C-g quitting from happening immediately.\n\ | |
2878 | Note that `quit-flag' will still be set by typing C-g,\n\ | |
690337b7 | 2879 | so a quit will be signaled as soon as `inhibit-quit' is nil.\n\ |
db9f0278 JB |
2880 | To prevent this happening, set `quit-flag' to nil\n\ |
2881 | before making `inhibit-quit' nil."); | |
2882 | Vinhibit_quit = Qnil; | |
2883 | ||
ad236261 JB |
2884 | Qinhibit_quit = intern ("inhibit-quit"); |
2885 | staticpro (&Qinhibit_quit); | |
2886 | ||
db9f0278 JB |
2887 | Qautoload = intern ("autoload"); |
2888 | staticpro (&Qautoload); | |
2889 | ||
2890 | Qdebug_on_error = intern ("debug-on-error"); | |
2891 | staticpro (&Qdebug_on_error); | |
2892 | ||
2893 | Qmacro = intern ("macro"); | |
2894 | staticpro (&Qmacro); | |
2895 | ||
2896 | /* Note that the process handling also uses Qexit, but we don't want | |
2897 | to staticpro it twice, so we just do it here. */ | |
2898 | Qexit = intern ("exit"); | |
2899 | staticpro (&Qexit); | |
2900 | ||
2901 | Qinteractive = intern ("interactive"); | |
2902 | staticpro (&Qinteractive); | |
2903 | ||
2904 | Qcommandp = intern ("commandp"); | |
2905 | staticpro (&Qcommandp); | |
2906 | ||
2907 | Qdefun = intern ("defun"); | |
2908 | staticpro (&Qdefun); | |
2909 | ||
2910 | Qand_rest = intern ("&rest"); | |
2911 | staticpro (&Qand_rest); | |
2912 | ||
2913 | Qand_optional = intern ("&optional"); | |
2914 | staticpro (&Qand_optional); | |
2915 | ||
128c0f66 | 2916 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
db9f0278 | 2917 | "*Non-nil means automatically display a backtrace buffer\n\ |
128c0f66 RM |
2918 | after any error that is handled by the editor command loop.\n\ |
2919 | If the value is a list, an error only means to display a backtrace\n\ | |
2920 | if one of its condition symbols appears in the list."); | |
2921 | Vstack_trace_on_error = Qnil; | |
db9f0278 | 2922 | |
128c0f66 | 2923 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
db9f0278 JB |
2924 | "*Non-nil means enter debugger if an error is signaled.\n\ |
2925 | Does not apply to errors handled by `condition-case'.\n\ | |
128c0f66 RM |
2926 | If the value is a list, an error only means to enter the debugger\n\ |
2927 | if one of its condition symbols appears in the list.\n\ | |
db9f0278 | 2928 | See also variable `debug-on-quit'."); |
128c0f66 | 2929 | Vdebug_on_error = Qnil; |
db9f0278 | 2930 | |
fc950e09 KH |
2931 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
2932 | "*List of errors for which the debugger should not be called.\n\ | |
2933 | Each element may be a condition-name or a regexp that matches error messages.\n\ | |
2934 | If any element applies to a given error, that error skips the debugger\n\ | |
2935 | and just returns to top level.\n\ | |
2936 | This overrides the variable `debug-on-error'.\n\ | |
2937 | It does not apply to errors handled by `condition-case'."); | |
2938 | Vdebug_ignored_errors = Qnil; | |
2939 | ||
db9f0278 | 2940 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
d0b68896 | 2941 | "*Non-nil means enter debugger if quit is signaled (C-g, for example).\n\ |
1b7d8239 | 2942 | Does not apply if quit is handled by a `condition-case'."); |
db9f0278 JB |
2943 | debug_on_quit = 0; |
2944 | ||
2945 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
2946 | "Non-nil means enter debugger before next `eval', `apply' or `funcall'."); | |
2947 | ||
2948 | DEFVAR_LISP ("debugger", &Vdebugger, | |
2949 | "Function to call to invoke debugger.\n\ | |
2950 | If due to frame exit, args are `exit' and the value being returned;\n\ | |
2951 | this function's value will be returned instead of that.\n\ | |
2952 | If due to error, args are `error' and a list of the args to `signal'.\n\ | |
2953 | If due to `apply' or `funcall' entry, one arg, `lambda'.\n\ | |
2954 | If due to `eval' entry, one arg, t."); | |
2955 | Vdebugger = Qnil; | |
2956 | ||
61ede770 RS |
2957 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
2958 | "If non-nil, this is a function for `signal' to call.\n\ | |
2959 | It receives the same arguments that `signal' was given.\n\ | |
2960 | The Edebug package uses this to regain control."); | |
2961 | Vsignal_hook_function = Qnil; | |
2962 | ||
db9f0278 JB |
2963 | Qmocklisp_arguments = intern ("mocklisp-arguments"); |
2964 | staticpro (&Qmocklisp_arguments); | |
2965 | DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments, | |
2966 | "While in a mocklisp function, the list of its unevaluated args."); | |
2967 | Vmocklisp_arguments = Qt; | |
2968 | ||
57a6e758 | 2969 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
61ede770 RS |
2970 | "*Non-nil means call the debugger regardless of condition handlers.\n\ |
2971 | Note that `debug-on-error', `debug-on-quit' and friends\n\ | |
2972 | still determine whether to handle the particular condition."); | |
57a6e758 | 2973 | Vdebug_on_signal = Qnil; |
61ede770 | 2974 | |
6e6e9f08 RS |
2975 | Vrun_hooks = intern ("run-hooks"); |
2976 | staticpro (&Vrun_hooks); | |
db9f0278 JB |
2977 | |
2978 | staticpro (&Vautoload_queue); | |
2979 | Vautoload_queue = Qnil; | |
2980 | ||
2981 | defsubr (&Sor); | |
2982 | defsubr (&Sand); | |
2983 | defsubr (&Sif); | |
2984 | defsubr (&Scond); | |
2985 | defsubr (&Sprogn); | |
2986 | defsubr (&Sprog1); | |
2987 | defsubr (&Sprog2); | |
2988 | defsubr (&Ssetq); | |
2989 | defsubr (&Squote); | |
2990 | defsubr (&Sfunction); | |
2991 | defsubr (&Sdefun); | |
2992 | defsubr (&Sdefmacro); | |
2993 | defsubr (&Sdefvar); | |
2994 | defsubr (&Sdefconst); | |
2995 | defsubr (&Suser_variable_p); | |
2996 | defsubr (&Slet); | |
2997 | defsubr (&SletX); | |
2998 | defsubr (&Swhile); | |
2999 | defsubr (&Smacroexpand); | |
3000 | defsubr (&Scatch); | |
3001 | defsubr (&Sthrow); | |
3002 | defsubr (&Sunwind_protect); | |
3003 | defsubr (&Scondition_case); | |
3004 | defsubr (&Ssignal); | |
3005 | defsubr (&Sinteractive_p); | |
3006 | defsubr (&Scommandp); | |
3007 | defsubr (&Sautoload); | |
3008 | defsubr (&Seval); | |
3009 | defsubr (&Sapply); | |
3010 | defsubr (&Sfuncall); | |
ff936e53 SM |
3011 | defsubr (&Srun_hooks); |
3012 | defsubr (&Srun_hook_with_args); | |
3013 | defsubr (&Srun_hook_with_args_until_success); | |
3014 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3015 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3016 | defsubr (&Sbacktrace_debug); |
3017 | defsubr (&Sbacktrace); | |
3018 | defsubr (&Sbacktrace_frame); | |
3019 | } |